11400 posts · Joined 2002. 350 TBI. It should be 62-90 kPa (9-13 psi). Question: I have a Passat B6 1. An expert whose answer got voted for 500 times. Estimated Ship Date: Wednesday 12/27/2023. Replies 26 Views 1K. 279 posts · Joined 2000. Product information . they are both reading 9 PSI with the fuel pump relay jumpered. Honda Odyssey Motor Mount Symptoms: Don’t Ignore These Warning. GM used both fuel pump relays and oil pressure switches. The Delphi diaphragm is made of nitrile, which. Fuel related. This pump supplies fuel pressure in sufficient volume to meet the engine's fuel requirement through all load conditions. Like you said factory spec is 9 - 13 PSI, preferably 11 - 13. The filter screens in the fuel tank can gradually get. When the fuel pump cycles OFF, pressure should drop to about 6 PSI and hold. 7L is OK and not the cause of your no-start condition. Code P0300 is. Excessive fuel pump noise. Year Warranty. 7 TBI Fuel Pressure Regulator (Topic#203809) Koolhand233 Forum Newbie Posts: 18 Loc: Maryville, TN Reg: 11-23-08. Been on quite the gremlin hunt going on a month. #1 · Sep 14, 2017. I found a kit made by standard auto that includes the spring and diaphragm for about $26; and a kit made by Delphi that includes the diaphragm, but not the spring, for $68. A bad IAC can cause starting problems. Mine could be different from yours. Important Tips And Suggestions. . Invest in an AC Delco pump AND filter (a plugged filter will wear out a pump prematurely too). 3 ltr. 2 volts before considering it WOT, but I have also seen 4. 96 Chevy truck replaced fuel pump twice and fuel lines, and only started when I put gas in the carborator what could it be. Part # FP10075. If one of these sensors’ values is out of the specified range, the check engine light will show up. Reaction score. My Web Site--darbys Elky. 7l TBI wont start sometimes. Sep 20, 2012. 54 volts. 7L 7. New Fuel pump relay 4. Free Shipping. The DCS gauge between the throttle bodies reads the regulated pressure and that pressure can be only as high as the fuel pressure regulator has been set for. With TBI the fuel pressure only needs to be 10-15 with 12-13lb's normal. Thick Layer on Spark Plugs. 3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed “Central Sequential Fuel. 5 psi to function correctly. The pressure should match your truck’s specified range. 0L & 5. . A sooty spark plug could just mean the engine is burning oil at that cylinder. Same engine and TBI. Keep screws and small parts you need to remove in a safe place so you don't lose them. I'm pretty sure it's got a leak in the base gasket between the throttle body and the intake (which is common). T'd a mechanical gauge in with the digital. 16 psi is to the high end but completely managed by the tbi fuel pressure regulator. 1985-91 Corvette 350 TPI. Chevy 350 tbi fuel pressure regulator symptoms can include engine hesitation, stalling, and poor acceleration due to fuel starvation. To measure fuel pressure, you’ll have to incorporate fittings to integrate a pressure gauge. 7 TBI. Fuel Pressure Regulator, 10-20 psi, Chevy, GMC, V6, V8, Each See More Specifications | Check the Fit. 63. ok so im not much of a forum guy so i figured since i have exhausted all my mechanical knowledge on attempting a repair and diagnostic of why my sysmptoms are there. Cut the fuel lines just after the fuel filter and loose the connecting pipes that used to go to the TBI. On my 1995 GMC Suburban I've been having shuddering and stalling issues when I'm going in reverse doing a hard stop or idling in the Drive-Thru. JET Adjustable TBI Billet Fuel Pressure Regulators 61500 Fuel Pressure Regulator, 10-20 psi, Chevy, GMC, V6, V8, Each. Apr 17, 2010. First fuel pressure. $157. Carter 61171. Symptoms: Stumbling/missing (cant really tell weather its a fuel issue, or a spark issue) under high load/ higher rpm. Just a suggestion but you could run a mechanical fuel pump on the ZX depending on how far you have it set back. While idling it's not like a heavy misfire just randomly misfiring more like a light stumble and under load it feels under powered and sometime it's. There are also other symptoms of a bad fuel pump, including:. To diagnose a bad fuel pressure regulator, follow these steps: Locate the Fuel Pressure Regulator: Pop the hood and find the fuel pressure regulator. in order to verify this, you need to take a fuel pressure reading. Check to make sure your check engine light is not on, or that it is on with the key on but the engine is not running. . Take it out. Engine backfires. How do i set timing on 1998 chevy truck 350 vortec. Check out free battery charging and engine diagnostic testing while you are in store. Fuel Pressure Regulator, Chevy, GMC, Hummer, Pontiac, Each. 7/auto, used short block with fresh heads installed 25K miles ago - those of you that followed the project may remember I replaced a ton of items as well to ensure its reliability. Black Smoke Generation Chevy 350 tbi fuel pressure regulator symptoms can include engine hesitation, stalling, and poor acceleration due to fuel starvation. Features: Test fuel pump check valve, fuel rail pop-off pressure, fuel rail deterioration, and leaking injectors. 7L TBI intermittently stumbles/stalls at idle, and frequently falls flat on acceleration down the - Answered by a verified Chevy Mechanic. One of the first symptoms of a possible issue with the fuel pressure regulator is engine performance issues. Re: New member here looking for some help with 350 TBI running rich. if you can what kind of tbi, year of your truck. If you ever suspect a fuel pump isn't working, I'd recommend pulling the fuel pump relay and jumpering the wires from B (+) to the pump supply. No sound from fuel pump (I assume it's electric and that I should be able to hear it running like I can in my 2002 Chevy pickup). Anyway truck was great but started backfiring and stalling etc. JET Performance Adjustable Fuel Pressure Regulator 1985-93 Camaro/Firebird 305/350 TPI. Link to actual tester350 TBI MODS. 0L, or 5. While idling it's not like a heavy misfire just randomly misfiring more like a light stumble and under load it feels under powered and sometime it's. I would think 7-8 psi is good. more info. I have a dead miss on one cylinder at idle - confirmed by cylinder drop test, vacuum gauge shows fast fluctuation 19-21 inHg, and the spark plug is significantly blacker than the others. By providing a ground path, the ECM energizes the solenoid which then allows vacuum to pass to the EGR valve. This is the first step to optimizing the TBI, without doing any grinding or machining; which will further increase the TBI to a max of 46mm (600cfm) That spring is the fuel pressure regulator spring. 1. i have a 1987 Chevy 1/2 ton 4x4 with a 5. 7L and 1987-93 7. Before you do, place rags under and around the Schrader valve (as a safety precaution, since fuel will leak when you install the fuel pressure gauge). . read moreGet the complete rebuild kit here at the Rochester 220 TBI and taking it apart. the chevy guys at the dealer also said that while it was running the pressure stayed between 9-13, which is what the book says, as well as some people that know for sure. To calculate the required fuel pressure we will use the square of the ratio of the injector flow rates (the 13 is the stock fuel pressure in psi for the rated 81 #/hr): SQ(106 / 81) * 13 = 22. so my fuel pressure is right where it. Dec 1, 2012. Fuel Pump: On 4. Could be the pressure regulator, fuel pump, or a restriction such as a plugged in-line fuel filter, plugged tank filter sock, severely kinked hose or sticking tank selector valve. 1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short. If its GM throttle body based, the pressure regulator is built into the TBI. Re: Only 7psi fuel pressure; 89 350 TBI, pump? 08-12-05 04:45 PM - Post# 759285. 1990 350 chevy in a itasca motorhome in park rough idle in drive it backfire in. 350 TBI. A bag fuel pressure regulator. If you need more help to. Now to the too much fuel. Under Pressure. modify your Oem fuel pressure regulator on gm and Chevy TBI units. 350"-5. 1. I need a diagram for a 1994 chevy silverado fuse box. 3. Engine won’t crank. 3 5. One of the first symptoms of a possible issue with the fuel pressure regulator is engine performance issues. 1) Verify voltage at the fuel pump connection. When it goes bad, the engine may hesitate, stall, and have… Reconnect fuel lines: Reattach the fuel lines to the new fuel pressure regulator, using the quick disconnect tool. TBI engines should not “diesel” (run-on) when shut off because there should be no fuel. Fuel related misfires can be caused from too much fuel. please help ,. When the ignition is cycled to the run position the ecm energizes the fuel pump relay for 2 seconds. When cold the idle fluctuates, i. I adjusted the pressure from 10. 5 diesel 5 spd dually,79cab 83 frame on tons, 83 sr5 dd other whips too. First you are going to need a HEI distributor, intake, and a fuel pressure regulator. Comes with the TBI adapter needed to check pressure the pump is a POS. Also, if using the stock TBI, then you'll need both lines (steel braided) that attach to the rear, properly rated fuel pump, and a fuel filter rated for the TBI unit (micron size). no gas is getting to the carb. 8L 4. Other bad fuel regulator symptoms include is fuel leaks from the tailpipe. Check the fuel pressure. New Fuel pressure regulator 5. Doing so will ensure that there is no power going to the fuel pressure. Also for an expirement try putting 12 volts to terminal G on ALDL that will put 12 volts directly to fuel pump (bypassing relay and oil pressure switch) and force it to stay on all time even when engine isnt running. If you crank it up too much, about 20 it will overwhelm the injector and flow fuel all the time. . 213. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. First thought was excessive fuel pressure. In response to dragula. Fuel Pressure tester kit used. 74 Chevy: 350tbi/400/205, 60/14 4. 350-3050. 1. August 6, 2018. When fuel pressure regulators go bad, it reduces the efficiency of the main engine. In this tutorial, I'm going to show you two different methods to verify if the no-start condition on your 4. When this happens, the regulator will build up more. 1. 35 people found this helpful. The regulator regulates the fuel build by the fuel pump. This answer was rated: ★★★★★. 1991 VIN Z 4. These engines are notorious for carbon plugging up the vacuum ports in the throttle body causing it to not get the correct vacuum signal to the map sensor. Year Warranty. A short tip for leaking TBI injectors on late 80's to early 90's Chevy fuel injection systems. 183 posts · Joined 2009. with a motor out of a 1986 chevy s10 2. Pinch off the return line or just dead head the supply line and tell us what the pressure is then. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch. 7L throttle body fuel injection (TBI) GM vehicle is due to a lack of fuel, which usually means that the fuel pump has gone bad. Fuel pressure AND volume need to be checked. they are both reading 9 PSI with the fuel pump relay jumpered. I am going to change the fuel filter and plug the egr valve. Add To Cart. 8 time out of ten code 44 is due to low fuel pressure or if one of the two injectors not firing. Gold = 16 to 26 PSI with EP377 pump (Spring pressure specs to follow) Silver = 27 to 29. 68 volts when I jumpered the fuel pump relay. Truck Year. In this tutorial, I'm going to show you two different methods to verify if the no-start condition on your 4. In this video, you will learn 7 symptoms of a bad fuel pressure regulator. Replace the line if it’s damaged. 6 FSI. Check the Vacuum Line: Detach. Like you said factory spec is 9 - 13 PSI, preferably 11 - 13. . 1986 Chevy G20 Tow Rig - 5. $4199. Check your regulator to see if it is adjustable. The 059-8758 is an excellent replacement crate engine for 1987-1995 GM trucks, vans, and SUVs. 1988 CHEVROLET TRUCK. 90 chevy 350 with TBI starts but wont stay running changed fuel filter and fuel regulator dont know what next. Once it does it fires no problem and idles very nice in park and neutral. I was just sitting there waiting on the light, and the truck died. Replace the line if it’s damaged. If you hear it it's not a fuse or relay. Had fuel pump and sending unit replaced, fuel filter, map sensor, coolant temp sensor, EGR, IAC motor, TPS. If you are concerned with fuel pressure, you will need to buy a fuel pressure gauge. Though the fuel pressure regulator has several moving parts, the entire part is replaced instead of trying to find the exact point of failure among the moving pieces. Here are different ways to check the operation of a fuel pump and a fuel pressure regulator. New engine and Trans and Tourqe converter, New fuel pump and Filter. #1. Inspect for External Damage: Visually inspect the regulator for any signs of damage, such as leaks, cracks, or broken connections. . The throttle body system sends fuel at a higher pressure than a carburetor needs, so the two aren't exactly compatible. Get the WHOLE complete TBI kit here QUICK AND EASY if you Dont remove what you dont have to. It will not do this again unless the ignition is switched off for at least 15 seconds. 4L MPI Fuel Pressure Issue. 4L BBC motors. The correlation between fuel pressure and injector sizing is one of the most common mistakes in conversions. Injectors are re-manned Fuel pressure regulator is rebuilt Fuel. Fuel pressure issue.