Question about 1986 Pontiac Firebird

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Fuel so the vechicle will start but run for 30 seconds at maximum and then shut down tis as if she is not gettin enugh fuel to the engine to stay running

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  • sayiwont_and Nov 30, 2008

    thank u man that is what i needed to know

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  • 35 Answers

Sounds like your problem lies either in your fuel pump or a stopped up fuel filter thanks jeff

Posted on Nov 30, 2008

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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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Engine runs for about 30 seconds and shutdown like an electrical shutdown as opposed to a fuel related shutdown.


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1 Answer

Why when my wifes sled overheated @ idle, will only stay running 30 seconds,keeps shutting down,will keep starting up and the that process starts again, 30 seconds,shuts down


first of all you need to know the year make and model of the vehicle you're talking about and exactly what is the real problem is it overheating I will not stay running

Mar 06, 2015 | Cars & Trucks

1 Answer

My 1989 f350 duelly starts in am and dies quickly bought coil and ecm cap rotor and backfires and shakes and dies any ideas.i was thinking distributor or fuel pump please help


If you spray starting fluid in the air intake, does it stay running? I would go to harber freight and get a cheap fuel pressure tester and hook it into the fuel line. It hsould be about 40 psi, and hold for about 30 minutes after shut down without bleeding down too much, like 5 psi.

Try this too. Turn key to ON, wait 5 seconds for the pump to shut off. Then turn key off and listen for the realy to "Cclick" under the dash (about 10 seconds). Repeat this. Then start engine. This primes the lines & injectors if you are getting bleed down due to a bad check valve in the fuel pump.
report resuts. pleasre rate assistance.

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2 Answers

I have a 2003 explorer sport. It starts up fine when it's cold, but if the temp is above 90, once I shut down it wont start back up. It will turn over , but quikly dies out even when pressing down on...


you have low fuel pressure for some reason, pump may be going or fuel pressure regualtor on fuel rail is bad.

pressure should be 43 psi, key on , engine off. and 34 with engine running.

Try this to confirm low pressure. Turn key to on and listen carefully for the pump to hum for 5 seconds. When it shuts off, turn key off. wait 30 seconds or until you hear relay click under dash. then turm key on for 5 seconds. repeat one more time. Then try to start engine. If it starts right up, pressure was low.

What you did was prime the system and built up pressure before start.

The pump only runs for 5 seconds when you turn key to ON, unless the engine starts. Then it stays on.

report results. please rate answer

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1 Answer

Vehicle ( Hyundai Accent ) start but quit after 10 seconds. For this problem we replaced ECM & Engine wiring Harness also fuel pump but problem was not solved pl guide


Find the fuel pump relay, connect across the contacts from B+ to the fuel pump. This will make the pump run continuously. see if the engine stays running. It may be a bad relay or a relay feed circuit which is also run the the auto shut down switch. Lee

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1 Answer

My 95 tahoe starts but dont stay on. Fuel wont stay pumping from tbi. Just swapped a motor from 80's camaro. Was running real good in box chevy perfect. Now fuel wont stay flowing out of injectors. Already...


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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