Tbi Fuel Pressure Regulator Adjustment

7 liter (TBI). The primary-pressure regulator main- When the engine is switched off, the fuel tains the pressure in the fuel system pump also switches off and the primary constant. A fuel pressure gauge must be purchased for setting the fuel pressure. on how well the fuel tables are feeding the engine. Where is the fuel pressure regulator on a 1994 Chevy truck 5. 4L V6 engines. It is designed to keep the fuel line pressure at a consistent value, allowing for smooth operation of the engine. In this video I show you the simple steps to adjusting your (FPR) fuel pressure using an adjustable one. So I just finished rebuilding the TBI assembly on my 1985 Mustang 5. The throttle looks like a carburetor without the fuel bowl, the metering jets or the float. It is quite easy to calculate the new flow rate of an injector when adjusting the fuel pressure. At idle remove the vaccum hose and the fuel regulator will rise to its highest setting. Purpose of the Rising Rate Regulator The Cartech regulators are designed specifically to add fuel to modified EFI engines (turbos, superchargers and normally aspirated). OK, dumb question but I have to ask as I am on my second Holley Regulator. 61510 TBI Fuel Regulator Kit JET Performance contains a billet adjustable fuel pressure regulator, all gaskets necessary and a heavy duty replacement diaphram. I'm using the stock internal regulator in the TBI unit. 4l/454 but at a much higher pressure. The adjustable fuel pressure regulator is used mainly for high performance applications. Provide fuel pressure assemblies, a fuel pressure adjustment tool, larger 90# injectors, ECM Harness Adapter Module HAM, a better than stock performance chip and have developed a new more efficient manifold for the crossfire engines called the Renegade. If using the stock style carburetor take a 5/16 fuel filter and put it inline with your charcoal canister. If the pressure is low it could be the pump, the hose between the pump and the sending unit, or the regulator. These JET adjustable TBI billet fuel pressure regulators ensure that your vehicle's fuel supply is precisely metered for optimum mileage and performance. To avoid interruption from contaminated fuel, a series of fue pump. turning the adjustment screw all the way in will result in excessive fuel pressure and cause the carburetor to flood. 5 - 6 psi of fuel pressure will work sufficiently. View Details. Remove spring and diaphragm assembly (22,23,24) NOTE: Whenever pressure regulator cover is removed, the diaphragm must be replaced to prevent. Again, if you notice even a slight issue, it's important to have it checked to correct any problems fast before further damage can be inflicted. Buy Throttle Body Shop TBS 10320 GM TBI 14 psi"YELLOW" Fuel Pressure Spring: Pressure Regulators - Amazon. A little adjustment should be all that’s necessary, 1-2 PSIG at a time. It is designed to keep the fuel line pressure at a consistent value, allowing for smooth operation of the engine. A wide variety of adjustable fuel regulator options are available to you, such as car fitment. There are some aftermarket TBI fuel pressure regulators available where you can tweak the fuel pressure to the injectors and thus the flow via an adjustment mechanism in the regulator spring. - or - MOdify the pick up so it's just like an LG4 pick up. It is machined out of billet aluminum which ensures extreme durability. Fuel pressure can be adjusted from 3-20 psi, making them perfect for carburetors, or you can install their included high pressure spring and adjust the fuel pressure from 20-60 psi for your EFI fuel system. Remove the fuel fittings from the TBI. They are built to OEM specifications and offer a precise flow and factory fit. The regulator is be used to maintain the precise pressure require and then returns any fuel unnecessary to that task back to the fuel tank. To allow the system to keep up with modifications the stock TBI pump was replaced and the fuel pressure regulator or the injectors or both needed to be adjusted. If the regulator opens low, the pressure will be low. Keep your fuel pressure stable with this quality genuine Volvo Penta marine fuel pressure regulator. I have a 95 GMC K1500 with the 5. Find CHEVROLET 5. All of the sensors were from the junkyard except the O2 and knock sensor which he got new on ebay for about $20 each. This will cause the spring to exert more pressure on the regulator diaphragm and regulate at a higher pressure. If you have an Aeromotive Fuel pressure regulator, when you put your ignition to the ON position and your pump is priming, it will register fuel, when it STOPS pumping, it will drop to 0. I imagine just strictly looking at the fuel system, there are really only four main components: Fuel pump, fuel filter, pressure regulator and TB injector. Another symptom of an issue with the vehicle's fuel pressure regulator is fuel leaks. This fuel pressure regulator can adjust the fuel pressure into the injector based on the change in intake manifold vacuum and make the difference between fuel pressure and intake manifold pressure remain constant. 1988 Chevy S-10 Need help with 4. com offers 603 adjustable fuel regulator products. The Sniper TBI unit comes with an integrated fuel pressure regulator. BBK Billet Fuel Regulators offer the most power and quality at a fraction of the price of other manufacturers. (stock pressure is 36 to 39 psi for 85-87, and 40 to 42 psi for 88 and later) 9. It is machined out of billet aluminum which ensures extreme durability. An electric fuel pump will also help prevent vapor lock in hot weather. As long as the fuel pump is not operating, the TBI fuel system components can be removed without the need to release the fuel system pressure. Buick 1992-1993 5. Our Throttle bodies are bored to 1. The same principle of operation applies. an fmu is a fuel pressure regulator, just boost referenced. Ensure the fuel pressure been properly adjusted and "Actual System Pressure" (Terminator - "Fuel Pres") accurately entered in Engine Parameters. Gusts of wind causing bumps which would cause momentary zero or even negative gravity state. If your regulator is adjustable (many aftermarket ones are), you can also adjust the fuel pressure to achieve different flow rates. A fuel pressure regulator commonly fails in one of two ways: When it fails to hold pressure, it provides too little fuel to the engine, causing a lean mixture (low pressure. Attach the fuel pressure gauge to the Schrader valve on the fuel rail. Loosening the screw. If fuel pressure is Within Check restricted return If pressure is the system pressure or fuel pressure regulator. We found a set of 80 lb/hr injectors on ebay for $60 and used a 15 psi pressure regulator from a junk 350 tbi. from it tells the computer how to adjust the air/fuel. It will mention the exact kind and variety of fuel pressure injection system that is used. The high pressure section of the fuel system - from the high pressure pump outlet to the regulator input (which is typically mounted to the the fuel rails) - must be done with high pressure fuel line rated for the intended pressure in the system. That should put you. The lower that pressure can be, the less it affects the pressure in the fuel rail(s). If you want to set your fuel pressure, make sure the "prime" is bypassed and the fuel pump stays running as it would while the car is. There will be a diaphragm and a spring under the housing. So no gas line going anywhere but from tank straight to tbi, and back. Also, there may be a blockage in the supply line or leakage in the return line. The Sniper uses four 100-lb/hr injectors and will feed up to a 650hp naturally aspirated engine. These JET adjustable TBI billet fuel pressure regulators ensure that your vehicles fuel supply is precisely metered for optimum mileage and performance. If Rest Pressure drops too quickly, check for leaks at o-rings and fuel line. (This prevents cleaning fluid from backing up into fuel tank through pressure regulator and fuel return line. To allow the system to keep up with modifications the stock TBI pump was replaced and the fuel pressure regulator or the injectors or both needed to be adjusted. High-Quality MSD 2938 Fuel Pressure Regulator in-stock and available to buy here in Auto Parts Warehouse. 0 GXi, I was doing a lot of reading and came across the service bulletin P-23-7 no. The fuel injection system does not digitally control fuel pressure. Twice the size and all. CAUTION: Unscrew in turn the two bolts in small steps (0. 3 liter? Answer. You can hide a small pressure regulator somewhere and a fuel pump with a regulator built in can be put in your fuel tank. Once the ignition key is inserted into the ignition, and the ignition moved to the I position, the fuel pump relay instantly initiates the. That should put you. Choose top quality brands AC Delco, Delphi, Forecast, Jet Chips, Replacement, SKP, Standard Motor Products, Walker. These JET adjustable TBI billet fuel pressure regulators ensure that your vehicles fuel supply is precisely metered for optimum mileage and performance. You can use a high-pressure gauge, but we used a TBI. Adjust pressure regulator to 5 psi under normal system pressure. The throttle looks like a carburetor without the fuel bowl, the metering jets or the float. It may be necessary to loosen the clamps located away from the TBI, in order to remove the lines from the fittings. In stock ships same day!. 7L was spec'd for. Tinware: fuel pump and mounting gasket (supplied with pump), fuel pressure regulator and gauge, 3/8" fuel hose and clamps, NPT pipe fittings Tip: When re-routing new lines, closely measure all of your lengths beforehand to avoid last minute miscalculations. The first TBI units developed strangely enough debuted on the 1980 Caddy as "Digital Fuel Injection" or DFI for short. If you're in the market for a new regulator, you can also replace it with our top-of-the-notch Jeep adjustable fuel pressure regulator that allows you to adjust fuel pressure from 1 to 6 pounds. However, if you are planning on a throttle body injection set-up, you need a dedicated TBI unit (in order to supply the fuel to the injectors, etc. 3l tbi turboed. Any pressure reading below 9 to 15 psi should be followed up by removing the fuel filter and rechecking. I'm just thinking the regulator in the TBI is not right. Fuel pressure regulator is integral part of throttle body. regulator will regulate that fuel flow adequately. I'm running an inline TBI fuel pump made for this motor. Note cell number RPM 2000 MAP 70. Let's just say the cost for the Pro gets me up close to the cost of the TBI conversion. The guy at tbi chips states he has a spring that will do 12-40 psi in the stock regulator with a fuel pump that will support it. Fuel pressure is the key to a properly functioning EFI system. The GM TBI is internally regulated and has a return line already virtually making the external regulator useless. I assume it would work. I'm thinking it's a distributor problem since it's not sending a signal to the comp to keep the injectors firing. Tried blocking the EGR. 4l/454 but at a much higher pressure. A wide variety of adjustable fuel regulator options are available to you, such as car fitment. Item-details FUELAB® 565 Series Fuel Pressure Regulators have all of the same great features as our 515/525 Series except for extreme capacity. FiTech EFI is dedicated to bringing the most advanced fuel injection systems on the planet supporting engines with up to 1200hp, 2X4, nitrous, boosted, and E85. The fuel pressure regulator kit. When servicing the pressure regulator, you check pressure at the test port. 412 x 36) + 6 = 77. An over abundance of gas in your cylinders will wash down your cylinder walls and accumulate in the oil. 5 psi with no leaks whatsoever. Ultimate (TBI) Mod, making stock fuel pressure regulator in GM #220 throttle body adjustible While installing a new fuel pressure regulator diaphragm in the Rochester #220 throttle body of my 93' GMC Sierra (SLE) Z-71 with a 5. A fuel pressure regulator is a device that is used to control the upper limit of the fuel pressure. An online search for causes of fouled spark plugs in Chrysler 2. I spoke with Howell directly about my fuel pressure at 14 lbs and this may be slightly high. It is designed to keep the fuel line pressure at a consistent value, allowing for smooth operation of the engine. Neutral switch adjustment. I noticed that the only publicated pressure recommendations I can find are that it should be between 9-13 PSI with engine off and pump on, I believe. When adding larger injectors, and upgrading your fuel pumps, it is imperative that you regulate the fuel flow to a consistent rate to promote a smooth tune, good idle, and proper fuel delivery under acceleration. So after having a fuel pump fail due to paint chips in the pump, on my 2005 volvo 5. I'm running an inline TBI fuel pump made for this motor. i had the aeromotive 13301 boost reference pressure regulator with low pressure spring. 6,8 / Fuel pressure too high / Pressure regulator, intake pipe connection, hose connection, fuel return line clogged or pinched, pressure regulator defective 1,2,6,8 / Temperature sensor II in engine defective / measure resistance 3 / Throttle won't close / Service throttle valve, align accelerator linkage, adjust throttle 7 / Throttle won't. A special fuel line filter should be incorporated in the fuel delivery line as well. Although it is possible to raise the fuel pressure it is a harder procedure to adjust it because you would. The best way to determine the dynamic fuel pressure is to flow the same amount of fuel as the nitrous system will demand. Start the engine and let it reach operating temperature. As long as the fuel pump is not operating, the TBI fuel system components can be removed without the need to release the fuel system pressure. To allow the system to keep up with modifications the stock TBI pump was replaced and the fuel pressure regulator or the injectors or both needed to be adjusted. Generally to set your fuel pressure on the W. The built in regulator will fight to maintain this. Fuel Pressure Regulators. A fuel pressure gauge must be purchased for setting the fuel pressure. If you learn how to test a fuel pressure regulator (FPR), you may save some money on repairs and get your vehicle going sooner. With key put bleed—Off tubing in a fuel Can and press 9. MSD's Atomic fuel pressure regulators can flow up to 500 liters per hour and have an operating range between 15 and 90 psig, making them compatible with many fuel systems. 3 thats not a sy/ty. Cadillac 1980 1990-1993 5. Note: To keep cleaner fluid from going back to tank, block the fuel return line or adjust the regulator to run vehicle at 5 PSI under fuel pressure specifications. (stock pressure is 36 to 39 psi for 85-87, and 40 to 42 psi for 88 and later) 9. The Cross-Fire design uses a low pressure with a specification of 9-13 psi. Your fuel pressure is not set properly or your fuel return line is restricted. A sooty spark plug could just mean the engine is burning oil at that cylinder. how to adjust air fuel mixture for tbi on 1994 chevy 1500 5. Higher pressure than 15 psi indicates. If there is a pressure regulator problem, the pressure regulator fits within the bowl beneath the fuel inlet. This regulator features a steel insert on the adjuster to prevent stripping and is easy to install. I have installed the 85+ fuel pump on two 82 crossfires and had no problems whatsoever. 7 - Chevrolet C1500 question how to adjust air fuel mixture. Turning the 5/32" allen setscrew inward (clockwise), increases fuel pressure. If the regulator opens low, the pressure will be low. Find Jet Tbi Fuel Pressure Regulators related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Jet Tbi Fuel Pressure Regulators information. A fuel pressure regulator is a device that is used to control the upper limit of the fuel pressure. If those base settings are correct and it still has the issue then I would be thinking MAP sensor or fuel pressure regulator. Find CHEVROLET 5. Provide fuel pressure assemblies, a fuel pressure adjustment tool, larger 90# injectors, ECM Harness Adapter Module HAM, a better than stock performance chip and have developed a new more efficient manifold for the crossfire engines called the Renegade. Replacement brand parts are the most affordable solution for all of your replacement needs! All Replacement brand items are backed by a 1-year, unlimited-mileage warranty. I recently did the heads on it and while putting everything back together replaced the stock fuel pressure regulator with an adjustable unit from Jet. Computer controls everything. That means if your fuel pump can support it this regulator can flow enough gasoline to support a 955 HP naturally aspirated engine or 772 HP boosted engine operating at that pressure. Remove fuel tank cap. 3 injector and bump it to 28-30psi and now be able to fuel a 454 (392). The fact that that line was poor is strictly my fault. The stock FPR is preset from the factory and is non adjustable so it will limit your options. Even at 60 PSI, this regulator still flows 70 GPH (265 LPH), meaning with an adequate fuel pump this regulator can feed a 700 HP (NA) or 560 HP (Boosted) gasoline application. To regulate the fuel pressure, the ECU simply adjusts the pump speed or fuel injector rate. While the advantages of being able to adjust fuel injector pressure are not certain, adjustment does give the opportunity to change open-loop fuel flow. TBI pressure regulator springs!! So like GM, we can take the cheaper 4. First find out the exact make and model of the car that you are repairing. Yours might be one of them, the GM service manual or online forum post might tell you what pressure a '95 5. That should put you. The pressure regulator has one of the most important jobs in the system: Control the. Again, if you notice even a slight issue, it's important to have it checked to correct any problems fast before further damage can be inflicted. There are some L31/30 guys that have disabled the internal fuel pressure regulator, and used an external vacuum referenced AFPR. Connect the fuel line to TBI as per typical carburettor. Monitor your adjustment with a fuel pressure gauge. A range of. I imagine just strictly looking at the fuel system, there are really only four main components: Fuel pump, fuel filter, pressure regulator and TB injector. (This prevents cleaning fluid from backing up into fuel tank through pressure regulator and fuel return line. Fuel system on 2. This fuel pressure regulator can adjust the fuel pressure into the injector based on the change in intake manifold vacuum and make the difference between fuel pressure and intake manifold pressure remain constant. This is produced through an electric fuel pump and stays consistent with the help of a pressure regulator. This will also allow for a much shorter return line and simplify the installation. Swap out the jeep pump and use a stock chevy pump. Fuel Systems for Your MicroSquirt® Controller. If using the stock style carburetor take a 5/16 fuel filter and put it inline with your charcoal canister. The BLM table shown below will give you the information so that you can adjust the main fuel table for good performance. - or - MOdify the pick up so it's just like an LG4 pick up. While TBI has a few crippling limitations it is still possible to pull a little over 1hp per cubic. 3l tbi turboed. A fuel pressure regulator is an integral part of a vehicle's fuel system. To avoid interruption from contaminated fuel, a series of fue pump. This pressure should hold for several minutes to an hour or more. If the pressure is too low, test the fuel pump volume. Ghetto Wagon 50,771 views. A fuel pressure gauge must be purchased for setting the fuel pressure. Re: TBI Adjustable Pressure Mod. Put a new fuel pump in it & brought it up to 16psi. Searching trouble shooting guides, we did not find anything indicating spark plug-fouling problems could be related to the fuel pressure regulator. Turn regulator on top of Fuel Injector Cleaner to full OPEN position (counterclockwise). I have been tweaking the pressure for years with the adjustable fuel pressure regulator mod in already in the FAQs. Caution: Fuel will. The regulator is inside the TBI unit. Cadillac 1980 1990-1993 5. The primary-pressure regulator main- When the engine is switched off, the fuel tains the pressure in the fuel system pump also switches off and the primary constant. For the 1988 to 1996 C4 corvettes, the stock fuel pressure is 40 to 42 psi with vacuum hose connected and 47 to 48 psi with the vacuum hose disconnected. Free shipping. 7:1 is critical to emission control Using a scan tool you can monitor "Fuel Trim" to see if engine is running rich or lean. If you check fuel pressure, be sure to use a low. The Holley TPI adjustable fuel pressure regulator kit will reuse the torx screws and base. They're both intank pumps, but I think the TBI pump is better simply because you'll have more pressure available, and you'll need it. Re: Little nitrous fuel pressure question WOW do I see it different than you guys, you want to use a flow jet on the fuel side and bypassing fuel not dead heading it and keep the N20 PSI the same thru the run using a N20 regulator keeping the bottle pressure high then taking it down to 900 then NEVER run it rich it kills motors lifting ring lands from the fuel getting under the rings. With TBI the fuel pressure only needs to be 10-15 with 12-13lb's normal. It is quite easy to calculate the new flow rate of an injector when adjusting the fuel pressure. Page 1 of 3: How to Test the Fuel Pump on GM TBI Fuel Systems. I do know that on a FEW later GM TBI applications GM ran higher than "normal" TBI pressures. View Details. Feed fuel in at one end, through each fuel rail and out to the pressure regulator from the opposite end. Re: Budget EFI on a 351W Ford. FUEL PRESSURE REGULATOR INSTALLATION: The fuel pressure regulator in this instruction sheet is designed to be an adjustable replacement for the stock O. An over abundance of gas in your cylinders will wash down your cylinder walls and accumulate in the oil. Gm Tbi Fuel Pressure Meter Regulator Block Off Plate Kit W Stainless Hardware. Since I am still running the carb, I had to install a fuel pressure regulator with a bypass. If not, they can be purchased under GM P/N 17111462. Generally to set your fuel pressure on the W. Flow to the TBi seems good. Your pressure should be right on the money though BigRay. There is an adjustment screw inside which is held in place with a large spot of solder. The PWM fuel pump is engineered to operate without an external fuel pressure regulator. Higher pressure than 15 psi indicates. ) Start engine. A range of. GM TBI systems have regulators that do not use engine vacuum. The regulators also feature a boost reference port that will raise fuel pressure on a 1:1 ratio. JET Performance Adjustable Fuel Pressure Regulators allow adjusting fuel pressure for maximum efficiency and horsepower gains. If Rest Pressure drops too quickly, check for leaks at o-rings and fuel line. MSD’s Atomic fuel pressure regulators can flow up to 500 liters per hour and have an operating range between 15 and 90 psig, making them compatible with many fuel systems. When you get the injectors back in and the injector pod is done, don't put it on TBI. 2: TBI pressure adjustment-1987-90 with 2. If you're in the market for a new regulator, you can also replace it with our top-of-the-notch Jeep adjustable fuel pressure regulator that allows you to adjust fuel pressure from 1 to 6 pounds. i didnt have a SES light on when my fuel pressure regulator went south. Once the plug is removed, the regulator can be reassembled. The fuel pressure regulator kit. Notes Will support engines up to 525 horsepower. 7L, 1982-1984 Corvette Crossfire Front and Rear. Try pulling the fuse for the fuel pump to see if it will run for a short period of time. Someone put the wrong ones on my motor and I wound up with 50 lbs pressure at the tbi. REPLACEMENT FUEL PRESSURE REGULATOR. JET Fuel Pressure Regulator Kit 38-1937 JET Performance Adjustable Fuel Pressure Regulator Kit is a direct replacement for factory unit and contains a billet adjustable fuel pressure regulator with a steel insert on adjuster to prevent stripped threads. k3500 silverado vortec 454 possible fuel pressure regulator? I have a 97 silverado 3500 with the vortec 454 in it. Twice the size and all. Attach the fuel pressure gauge to the Schrader valve on the fuel rail. The high pressure section of the fuel system - from the high pressure pump outlet to the regulator input (which is typically mounted to the the fuel rails) - must be done with high pressure fuel line rated for the intended pressure in the system. At full power the engine would quickly starve of fuel. A running TBI engine will have 14-15 psi. Plus, you shouldn't be playing with any screw in TBI. MSD’s Atomic fuel pressure regulators can flow up to 500 liters per hour and have an operating range between 15 and 90 psig, making them compatible with many fuel systems. Upgrade Or Repair Air Intake Systems and Fuel Delivery Components. The fuel pressure for the 502-6 should be 11 psi. While TBI has a few crippling limitations it is still possible to pull a little over 1hp per cubic. Turning the 5/32" allen setscrew inward (clockwise), increases fuel pressure. Gm Tbi Fuel Pressure Meter Regulator Block Off Plate Kit W Stainless Hardware. Option #2: Install a system from a JY vehicle and reprogram the chip for your particular vehicle. Safely tests vehicle fuel pressure systems on GM TBI vehicles not equipped with a Schrader or fuel access valve test port on the fuel line. If those base settings are correct and it still has the issue then I would be thinking MAP sensor or fuel pressure regulator. fuel pressure regulator is on top of. Fuel system on 2. alot of web sites i go to say replacing the fuel pressure regulator with an adjustable one helps out. But the TBI injectors needs the 9 to 13 lbs pressure. TBI 220 Fuel pressure regulator change 3 - Duration: 1:58. The fuel pressure regulator adjusting screw is located behind an aluminum plug in the nose of the fuel pressure regulator casing. Unlike the fuel pressure regulator on the O. A regulator maintains the required level of fuel pressure under all conditions by routing excess fuel back to the tank via a separate return line. The Sniper TBI unit comes with an integrated fuel pressure regulator. There are some aftermarket TBI fuel pressure regulators available where you can tweak the fuel pressure to the injectors and thus the flow via an adjustment mechanism in the regulator spring. Yours might be one of them, the GM service manual or online forum post might tell you what pressure a '95 5. Try pulling the fuse for the fuel pump to see if it will run for a short period of time. With TBI the fuel pressure only needs to be 10-15 with 12-13lb's normal. Since the engine is injection engine and the fuel pump was whining, this was the key to find a problem. If the pressure drops off quickly, either an injector is leaking, the fuel pump check valve is not working, or the fuel pressure regulator is at fault. Both throttle body injection (TBI) units are connected at the bell crank and are synchronized with each other t The fuel pressure is 42 Lbs. 7:1 is critical to emission control Using a scan tool you can monitor "Fuel Trim" to see if engine is running rich or lean. Remove the aluminum plug with a small punch and hammer. I bottomed the screw out, and was only able to achieve 4 psi. Fuel Pump, Filter, Regulator and Line A higher output pressure fuel pump is necessary to provide the injection pressure necessary for proper operation. This may give a check engine light, also. The regulator is inside the TBI unit. Find CHEVROLET 5. FUEL PRESSURE REGULATOR INSTALLATION: The fuel pressure regulator in this instruction sheet is designed to be an adjustable replacement for the stock O. I used some double-jacketed fuel line from Jegs (push lock type) hose at the back of the TBI on both the feed and return lines and run a cheap Summit 0-30 fuel pressure gauge. A problem they've seen in their MGB race car so they no longer use the Holley regulator. The whole top of the housing will have to. The Sniper uses four 100-lb/hr injectors and will feed up to a 650hp naturally aspirated engine. Wiki User 09/27/2009. An online search for causes of fouled spark plugs in Chrysler 2. It is quite easy to calculate the new flow rate of an injector when adjusting the fuel pressure. by Julian Edgar. I am still trying to survive with mine mounted on the frame. Pressure is controlled by a computer, which monitors a series of engine sensors to determine how much fuel to deliver. You would make your adjustment their and only be concerned with that reading as far as power goes. TBI fuel injection is a type of fuel injection system where the fuel is injected into the throttle body. When servicing the pressure regulator, you check pressure at the test port. Buy Throttle Body Shop TBS 10320 GM TBI 14 psi"YELLOW" Fuel Pressure Spring: Pressure Regulators - Amazon. Since the engine is injection engine and the fuel pump was whining, this was the key to find a problem. The TBI Fuel Pressure regulator is a common problem. 52; Buy It Now +C $25. Those that have played with GM TBI know that around 1994 GM started using a much smaller injector in the 7. I'm seeing 14psi+ from both regulators. If it is sooty, it could be a sign of a bad fuel pressure regulator. IF the regulator was at some earlier time adjusted for more pressure than the factory setting it is possible it never caused a problem before because the old original fuel pump had an output pressure of only around 12-14 psi when new. GM TBI systems have regulators that do not use engine vacuum. The only thing >that you can adjust is the fuel pressure on the fuel pres regulator, and it is pre set at the factory. I put a fuel pump in my 95' for a 97' that will push 80 lbs. Symptoms of a Bad Fuel Pump. This pressure should hold for several minutes to an hour or more. Everything includes the Tanks Inc tank with internal electric fuel pump. Call or Shop online now. This will also allow for a much shorter return line and simplify the installation. Made from tough, rigid material. Turn ignition on and listen for fuel pump operating sound for approximately 2 seconds. Air Intake and Fuel Delivery. Application: Top-Down Solutions tested the stock spring (orange in color) that comes with the GM 17113186 vacuum adjustable fuel pressure regulator (used on GM TBI equipped engines) and found the spring rate was too high. Hook it up to fuel lines and turn on key and watch pressure, you get 2 seconds. 7L/350 Fuel Pressure Regulators with V8 Engine Type and get Free Shipping on Orders Over $99 at Summit Racing! JET Adjustable TBI Billet Fuel. Install the fuel pressure gauge according to the manufacturer's recommendation. A regulator allows some of the fuel to bypass the injectors and return to the tank, maintaining a certain regulated pressure.