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Turning the key the fuel pump relay operates for about 1 sec then shuts off no fuel. the eng man light flashing off and on

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Needs replacement. its bad fuel pump now ok

Posted on Jul 30, 2009

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Where is the fuel shut off switch in my 2002 mazda 626


Your vehicle does not have an impact activated fuel shut off switch like the ford vehicles. Power is provided to the fuel pump by the fuel pump relay. Power is provided to the fuel pump relay by the Main relay. Both relays are controlled by the Engine computer or PCM. The PCM can disable the fuel system by not energizing the fuel pump relay if the immobilizer system has been triggered by the use of a non-authorized ignition key being used to start the vehicle. This should also trigger the security light to be flashing on the instrument cluster as well. Look for that rapidly flashing security light to see if this is the problem.

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2009 387 isx pete start might run 1 min might run 25 min ck eng light stop eng light comes on dies cycle key it will start right back up same thing


could be a weak fuel pump or regulator fault (fuel) faulty relay pump/injection ether one. idle valve sticking. these will all need to be checked.

Oct 09, 2013 | Cars & Trucks

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1996 Oldsmobile Cutlass Ciera will not start. need to know were the fuel relay is located. we thing its the fuel pump but would like to try the relay first. car ran on friday. started to check tail lights...


I would check the fuses in the fuse box first there might be a fuse for the fuel pump that's burnt out.As far as the relays it should say on the inside of the cover to the engine compartment fuse box.If you have the owners manual it should say in there also.

Feb 28, 2011 | 1996 Oldsmobile Cutlass Ciera

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Ive got a 1997 cavalier it will start but quickly dies out ive got fire to my plugs and fuel to the injectures ive just replaced the ignition switch is there somkind of a security


You need a new fuel pump relay. The engine fires up and runs off the oil pressure switch untill the oil pressure PSI is reached at normal operating conditions. When the oil pressure reaches its operating PSI the PCM or engines computer will shut off that circuit and turns on the fuel pump relay to run the fuel pump untill you shut the engine off

Apr 19, 2010 | 1997 Chevrolet Cavalier

1 Answer

3.8L V6 engine will turn over run 2 sec. shut down. replaced map, fuel inj., o rings, fuel pump, press. reg.,


There's no use guessing anymore, have a quailfied independent repair shop diagnose and fix it. Stay away from chain stores. The money you have already spent guessing would have it fixed by now. Ck the ASD and Fuel pump relays, and go from there. Is there any tropuble codes in the ecm? On some of these you can turn the ign key on-off 3 times and read codes from the ck eng light.

Feb 06, 2010 | 1993 Chrysler New Yorker

1 Answer

Fuel pressure


could be, fuel filter,pump,relay, turn key on but dont start, do you here the pump? should run bout 2-3 sec then shut off. if its really losing pressure while running, its most likely ur pump..

Jul 29, 2009 | 1991 Saturn SL1

1 Answer

1988 ford truck f-150 xlt lariat cant get current to fuel pump


Have you checked the 'inertia switch' which in the event of an accident shuts off the fuel supply to prevent a fire . It's usually located in the cab on pass. side. Some models have one reset button, some 2 which have to be pressed at the same time. If that's not it, here's how the power to the pump SHOULD work, you will have to follow the path to see where it stops. When you turn the key on it turns on the EEC power relay on, this relay then provides power to the PCM (power control module) and the control side of the fuel pump relay. Power for the fuel pump is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse current flows thru the fuel pump relay and inertia switch to the fuel pump. The fuel pump relay is controlled by the PCM. When the ignition switch is turned on the fuel pump will operate, if the switch is NOT turned to start position, the PCM will shut off the fuel pump off after 1 second. This is to avoid flooding the engine when it is not running, just key on. So check out to see if you have a fuse link or a high current fuse and if they are blown.

Apr 14, 2009 | 1998 Ford F150 Regular Cab

1 Answer

1987 4.3L starting difficulty


First off, I'm a great believer in the simple solution. If jumping the relay works, then replace the relay.

As far as a relationship between fuel pump operation and oil pressure, coincidence of operation.

If the new relay fails you, I'll need some more info:
  • Fuel Injected? If you turn the key on (not to start) do you hear the fuel pump come on for a sec then shut off?
  • Hard to start when hot, cold, doesn't matter
  • When it does start, does it idle ok? erratically? High? Won't stay running? Dies immediately?
  • Does it blow smoke? Black? Blue? White?
  • When driving, does it lack power? Stumble? Stall?
Hope it's the relay

Mike

Jun 18, 2008 | 1987 Chevrolet Astro Cargo

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