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If I disconnect my fuel pump relay vehicle dies its supposed to keep running and miss some other relay or something to do with the oil and then working properly any ideas 94 GMC 1500

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  • GMC Master
  • 3,218 Answers

Gm used the oil pressure switch to provide fuel pump power once the vehicle was running and oil pressure was up on the older models

Posted on Apr 11, 2015

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6ya6ya
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Posted on Jan 02, 2017

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Centaur89
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SOURCE: fuel pump 2000 chevy blazer

Check your connections. did you run the fuel pump wiring under the drivers side door sash like GM did?.. if so check for nicks in the wire or bending or cracks.. this happens.. happened to me. check your fuel pressure. 40 dollar part at an auto store. If its below 59 PSI it wont work. And blazers are very intolerable to low fuel pressure. Also try taking the negative post off your battery for a little while and then putting it back on and if you can get it started again drive around (if its safe and running decent) for at least 30 minutes to get your car computer system acclimated to a new functioning part. Did you check the fuel filter?. rule of thumb when a pump goes change the filter its always the last thing people expect because we all jump to catastrophic engine failure at the first no start moment. lol.
Make sure that all your ducks are in get my drift.. Air oxygen fuel thats the mixture you need to check all those vital parts. before pulling your head off.

Posted on Aug 08, 2008

  • 1 Answer

SOURCE: 94 GMC truck diesel starts,runs and then dies and will not start

I have the same problem and have trouble codes 35 and 36. I found out that there is a computer module that needs replaced as it sits low in a valley and gets hot and seperates. I am reseaching about the a/m fix that installs the new module away from heat.

Posted on Mar 12, 2009

honeymokey
  • 3113 Answers

SOURCE: 1998 gmc 2500 wont keep running

The anti thieft system is keeping it from running.

Posted on Dec 13, 2009

  • 41 Answers

SOURCE: 1998 gmc sierra k2500 wont stay running

you'll need a professional computer to reset how ever there are two relays for fuel on chevrolet
i would suggest finding the second one first

Posted on Dec 14, 2009

greezy_je208
  • 237 Answers

SOURCE: 1998 gmc 2500 sle 5.7 wont stay running

this is in fact the right answer check the oil guage in the truck it should read about 375.

Posted on Dec 15, 2009

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1 Answer

Put on new fuel pump got pressuer but want stay cranked


Your post is lacking any detail. However, if you are stating that the engine starts after being cranked but dies out (wont stay running) there are 2 ways the fuel pump is activated. When the key is first turned on, there is a 5 second fuel pump run (the ECM energizes the fuel pump relay). After the engine starts, the fuel pump relay will only stay energized when the oil pressure switch closes keeping the fuel pump relay on (oil pressure is above 5-7 psi). If the oil pressure switch is faulty or there is no oil pressure, the engine will stall just after starting.

Apr 10, 2014 | 1999 Chevrolet Astro

1 Answer

Runs then just cuts off


if your car have sensor, replace oil sensor, or try to disconnect the oil sensor then start the engine, or make sure the water and oil level are ok

Oct 28, 2012 | 1992 Chevrolet C1500

1 Answer

97 f350 5.8 disconnected fuel line from tanks to inline filter turn on key pump runs momentarily then shuts off only supplying small amount of fuel from either tanks


Generally speaking, its supposed to do that.
The fuel pump(s) is powered by a relay that turns on for 3 seconds when you turn the key on. If the engine does not start and produce oil pressure, thats all the power the pump gets. If you were in a wreck the pump would shut off when the engine dies even with the key on to prevent a fire.
You would need to jumper the relay to make the pump run beyond the 3 second time.

Aug 03, 2012 | Cars & Trucks

1 Answer

Truck lost power and died, started and wouldnt gain power to run ribbed to 800RPM and died caughed a little. replaced fuel filter same problem. Disconected filter turned key on pump ran for a second ane...


Modern fuel injected vehicles will only run the pump for a couple of seconds to pressurize the fuel system at stat-up. The pump won't run after that until the engine is running or you are actively engaging the starter. The fuel pump and relay are doing exactly what they are supposed to do. Now, that doesn't mean the pump is building pressure like it should but the pump running for a second then shutting off after you first turn on the key is normal operation. You may have entered it, but I can see no information about what vehicle you are working on other than it is a truck. More information about the vehicle would help. In the mean time, I feel a compression check is an order and you should take a look at the oil to make sure there isn't any water mixed in. Some history would help as well, like if you have done any type of service in the last month, when the basic maintainence was done, how many miles are on it, etc.

Oct 30, 2011 | 2002 Chevrolet Silverado 1500HD

1 Answer

1998 GMC Savana conversion van - It starts right up and immediately dies, repeatedly and randomly. Sometimes it won't start for days. Then poof, starts right up. It turns over fine, it starts fine. The...


It won't die when pulling the relay because it has another power path to the fuel pump through the oil pressure switch . Fuel Pump Electrical Circuits Description and Operation watch this video on fuel pump control , shows chrysler first , ford ,then gm . wait for gm an he explains the oil pressure switch . Plus when it won't start ,don't guess or theorize ! Test what's missing ? check for spark , no spark check ignition system , coil's , ignition module , crank sensor etc... has spark ,do a fuel pressure test etc... don't think computer , when it won't start does the check engine light come on with the key on run not start . If light is lit ,nothing wrong with the cumputer . If want to fix cars you really should take some automotive classes . Test don't guess .Watch some other videos crank no start videos etc...

Mar 02, 2017 | 1998 GMC Savana

2 Answers

Is there a reset button on this fuel pump


CHEVY DOESN'T USE A FUEL PUMP RESET/CUTOFF SWITCH, FORDS USE THIS FEATURE, ON A CHEVY IT IS DONE WITH THE OIL PRESSURE CUTOFF SWITCH, SO IF U LOOSE OIL PRESSURE THE FUEL PUMP CUTS OFF, THIS OIL PRESSURE FUEL PUMP CUTOFF SWITCH AND IT'S WIRING ARE NEAR THE OIL FUILTER UNDER THE TRUCK.

Apr 21, 2010 | 2000 Chevrolet Blazer

4 Answers

My 2005 dodge magnum sxt AWD is having starting problems. It has happened twice so far. I start the car and then it dies. start again and it dies again. try again and it won't even start. I've checked...


I'll be honest, it sounds like the transmitter in the key isnt reading. A key remake without the factory transmitter will start the car, but only keep it running for a few seconds before cutting power to the motor. your electronics will still run....This may be too obvious, but honestly, thats what it sounds like.

Mar 30, 2010 | Dodge Magnum Cars & Trucks

1 Answer

Fuel pumpfuse keeps blowing


Disconnect the batter. Under the hood, you should find a fuse/relay box. There you will find a Fuel Pump Relay. The back side of the box lid will have a diagram (should have) that will indicate which one is the Fuel Pump Relay. Replace the relay and try again. If the problem persists. you may need a new fuel pump. Some vehicles are equiped with a "secondary' fuel pump, usually located near the back of the engine, mounted to the frame. This one will be easier and probably cheaper to replace, vs the one in the gas tank. In my experience, even with a plugged fuel injector, an engine will still start and run, just not as smoothly. Also, check all your spark plug connections, battery connections, and starter connections. Do this with the battery disconnected. This is just a way of making sure all connections are good, in the even that is the problem. You can do this before purchasing any parts. For your battery, you can put some terminal grease on them to prevent corrosion, rust, and acid build up; a common cause for faulty connections, resulting in such issues.
I hope that this information was useful, and aids in the successful recovery of a healthy running vechile for you.

Mar 24, 2009 | 1996 Nissan Pickup

1 Answer

No fuel to engine


You should have 2 fuses, 1 marked ECM/IGN that is 10amp, and one marked ECM/Batt, that is 15amp. Make sure they are both good. Your GM vehicle probably also has a fuel pump/oil pressure switch also, that affects fuel pump operation . Engine dies, oil pressure drops in an accident, it shuts off fuel pump. You may want to try wd-40 sprayed into the throttle body intake a little at a time to try & start it, and run long enough to build up oil pressure, (couple of seconds.) otherwise look for a red wire near brake booster or drivers fender, that is for fuel pump testing. if you carefully,supply it with a 12v+ source it should start fuel pump and keep it running while you start it, and once running, remove the wire & see if it keeps going. Make sure your oil level is up too.

Jan 30, 2009 | 1994 Chevrolet Astro

1 Answer

My 92 sunbird will run untill it starts to get warm and then just dies. I when I try to start it after it dies and the car will just keep turning over and wont start. it sounds like the fuel pump doesn;t...


thers a oil psi senser that wont let the fuel pump run at low psi when the car worms the psi gos down ,the fuel rely only runs the pump for about five sec as a primer then the oil psi senser takes over thirs a plug righi behind the oil fliter for the senser ,un plug it and put ajumper wire across it as a test ,you may need a oil pump

Dec 10, 2008 | 1992 Pontiac Sunbird

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