Question about 1990 GMC Sierra

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My fuel pump keeps running on occasion after turning off ignition. It runs until the battery runs down. Does not do it always. What's the cause and solution?

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It sounds like your fuel pump relay is sticking sometimes when it gets hot.

Posted on Aug 27, 2010

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Several possibilities. One is that you said you checked the relay, but clearly either the relay is not getting power or is not working. Another is that the fuel pump only goes on for a few seconds if the motor is not running, so if you have left the ignition switch on, do not expect the fuel pump to keep running. You have to keep turning the ignition on and off. The system that is used to detect the engine running and shut down the fuel pump when the engine is not running, varies. I am mostly familiar with imports, and they tend to use alternator output to detect engine running so pump should stay on. Some US cars us the oil pressure switch, and you can tell because then the oil pressure switch has more than 1 wire.

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Electronic fuel pump doesn't alway run when you turn on the ignition


That only means the pressure is still within range,so it doesn't have to run until injectors let fuel thru into engine and it fires up.
What problem are you having,that makes you think it has a fuel problem.Be specific,please? don-ohio (:^)

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Shouldn't there be fuel pressure with the key turned to the run position? I only get fuel pressure when the starter is engaged and turning the engine over.


no you will not have fuel pressure untill the engine is running

fuel pressure is not required to start the engine...only to keep it running

when you turn the key on the computer send a signal to turn the fuel pump on for a second and prime the engine...once it starts the fuel pump relay kicks the fuel pump on then you have pressure.

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hello. perhaps I can assist you.

Perform this test:

Fuel pump test:

1. Get yourself a helper.

2. remove the gas cap.

3. have one person listen in the gas tank at the gas cap opening.

4. have the other person turn the ignition switch to the ON position ONLY so as the dash lights come on. Do NOT attempt to start the engine.

5. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.

6. Does it ?.


If you do NOT hear it run, in most cases the fault is the fuel pump relay or the fuel pump..


As soon as you turn ON the ignition switch to start the engine a 2 second ONLY battery voltage signal is sent from the computer to the fuel pump relay and from the relay back to the fuel pump in the fuel tank. This runs the fuel pump for ONLY 2 seconds of which pressurizes the fuel system in preparation to start the engine.

Once the engine starts, The computer BYPASSES the fuel pump relay and sends constant contionous battery voltage from the computer to the oil pressure switch of which is now CLOSED because the oil pressure is UP because the engine is running. Therefore the battery voltage flows thru the oil pressure switch back to the fuel pump to run the fuel pump constantly until you turn OFF the engine.

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Looks like your battery has been drained out.Get it fully charged and then try starting the car........sodeep

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also check the ignition switch and ignition module.

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