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Ford explorer- put in new fuel pump and a new relay, problem is when i shut off engine pump is still running.

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The relay is defective (stuck closed) or somehow the wiring is shorted,

Posted on Aug 11, 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.

Oct 07, 2016 | 1993 Ford F150 SuperCab

4 Answers

Theft light on will not run


jump fuel pump relay , connections 87 + 30

Mar 19, 2014 | 1999 Ford Explorer

1 Answer

Car will turn over but won't start. Through the


No noise from fuel pump when you turn over the car .First thing get voltage at fuel pump relay checked, is there 12 volt to the relay.If no, then problem is again the relay.--------- To reconfirm the problem, try other test, that is remove the relay and by pass the relay terminals with a jumper wire .Then with 12 volt external battery give power to fuel pump connector and see, if the fuel pump starts, then its clear that fuel pump relay is faulty.----------- Also other problem can be fuel pump inertia switch.If the inertia switch is faulty then also fuel pump will not start.-------- The fuel pump relay on a 1995 Ford Explorer is in the power distribution
box, in the engine compartment, driver's side near the firewall.----------
The fuel pump inertia switch is in the right front passenger area
it is below the dash but above the carpet in the right hand corner.--------
Its a push button type inertia switch.
--------
Fuel Pump Activation
When ignition switch is turned to START position, PCM operates fuel pump relay to provide fuel for starting engine. PCM senses engine speed and shuts off fuel pump by opening ground circuit to fuel pump relay when engine stops or engine speed drops to less than 120 RPM. When ignition switch is in ON position, EEC power relay is energized (contacts closed). Power is provided to fuel pump relay and timer in PCM. Fuel pump receives power through fuel pump relay contacts.
Inertia Fuel Shutoff (IFS) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle rollover, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not restart until switch is reset. Fuel system should be inspected before resetting switch.
IFS switch is located under instrument panel, near right side of transmission hump.
----------- If the fuel pump relay, the inertia switch and fuel pump all checked ok, and fuel pump is working with direct 12 volt source to fuel pump.Then problem relates to computer.The computer (power control module, PCM) is faulty and has to be replaced.--------- This will help.Thanks.Helpmech.

Jul 17, 2011 | 1995 Ford Explorer

2 Answers

New fuel pump new regulater .fuel pump runs but will not prime up and shut off


sounds like you hooked the hoses up wrong at the pump unit or you have a bad fuel filter...replace the filter first..then check those hoses and clamps.

Feb 07, 2011 | 1995 Ford Explorer

1 Answer

98 ford explorer fuel pump only work for one second than shut off when you crank the engine the fuel pump shut off


Check the fuel pump relay connections, the Explorer is bad about connection corrosion at the relays, try unplugging it and sticking it back in. Hope this help, let me know.

Aug 04, 2010 | 1998 Ford Explorer

1 Answer

I dropped the fuel tank to drain old gas.I put new gas in and turned engine to start it didnt start. Should I be able to hear fuel pump if it is working?This is for a 1990 ford e-150 van.Also where the is...


Turn the key to the ON position without starting the engine. You should hear the fuel pump running for 5 seconds if working. This primes the gas to the injectors when doing this. If not heard running check the oil pressure switch for the 12 volts needed to run the fuel pump starts there on that harness. When the engine starts and the oil pressure reaches the normal pressure the computer shuts off that circuit and turns on the fuel pump relay to run the pump. The relay stays on till you shut the engine off

May 08, 2010 | 1990 Ford Econoline

1 Answer

Where is the fuel pump relay in a 91 ford explore??


In the underhood power distribution box, the fuel pump relay is the same as the a/c relay swap the two and see if your pump starts to run, if so replace it, if not check power at the pump connector located on top of fuel tank, if it has power and the pump does not run then the pump is bad, remember when testing for power the fuel pump only runs for about 3 seconds when you turn on the key, after that you have to crank the engine, hope this helps, let me know

Dec 08, 2009 | 1991 Ford Explorer

1 Answer

1999 ford taurus isn't getting fuel


Oil pressure sensor is part of the fuel circuit. You changed engines, did the new one have the same sensor?

Aug 30, 2009 | 1999 Ford Taurus

1 Answer

I bought a 92 ford explorer. It will not start


if it runs off starting fluid then shuts off then its the fuel pump and will need to be replaced

Dec 29, 2008 | 1992 Ford Explorer

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