Question about 1995 Oldsmobile Aurora

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My fuel pump stays on after i shut the car off

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I believe the relay contacts for the fuel pump remain in the closed position. Try interchanging with another relay or put a new relay. by interchanging with another relay the problem is solved, change the relay for the fuel pump

Posted on Aug 02, 2009

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I have a 93 Ford F150 4.9 liter. And when I go to start it the fuel pump stays running for close to four minutes and then it will not start until the fuel pump shuts off?


OK, when you turn the key to on, it will start the pump for about 2 seconds-this is just to put pressure in the lines and in the fuel rail for easy starting. If key is not turned to start, pump will shut off after 2 seconds. But when cranking in start, and when engine is running, the pump is on full time.
If your pump runs longer than 2 seconds with key only in on position, you have a fuel circuit problem. It very well could be a bad fuel pump relay staying on. Or it could be a computer problem signaling the relay to stay on longer. Try a new fuel pump relay first and see if that was the problem.

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What is shutting off when the engine dies ? Is the fuel pump loosing power from the relay ?

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did you install the oil pressure switch origional to the tahoe? The tahoe uses a low oil pressure shutdown, instead of an inertia switch to shut off the fuel pump in the event of an accident. If the pressure circuit does not close within 3 seconds after the engine starts the fuel pump shuts off. This is in case the truck is on its side or upside down the pump will shut off.

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REPLACE FUEL PUMP RELAY.SOUND LIKE ITS STAYING CLOSE..

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I have 1989 f-150 4.9l 6 cly engine. The fuel pump shuts off.


check the emergency fuel shut off switch it may be half set it is on the firewall by the clutch pedal reset it if that does not work it is a relay or a short in the pump it is not pushing enough pressure to keep it running

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