95 Explorer Fuel Pump Issue
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95 Explorer Fuel Pump Issue
I have a 95 XLT Explorer with a fuel pump issue. Two years ago the fuel pump died so I replaced it. About 6 months ago another problem started. When you turned the key to On (before trying to start it), the fuel pump would take longer than the 2 seconds it normally takes to prime the line. Sometimes it would take 30 seconds, other times it would take minutes. If you tried to start the truck before the fuel pump was stopped running, it would not start. If you waited until the fuel pump stopped, the truck would start instantly. It seems the problem is getting worse and taking a longer time to shut off upon starting. I don’t know if the trouble is the pump or something else.
It seems like the longer the truck sits before starting, the worse the problem. If you start the truck after sitting 4 hours, there is usually no issue. But if the truck sits for about 12 hours that’s when the problem starts. There is no smell of gas in the garage so there is not a gas leak. Yesterday when my wife went to start it, she said she tried turning the key on twice and did not hear the fuel pump at all. The third time the pump turned on, but it took about 3 minutes before it shut off. Then it started fine. This morning (after sitting 12 hours), I turned the key, heard the fuel pump for about 2 seconds and all went well. My guess is that there is something flaky with the fuel pump. Either the pump is running but not pumping anything, or the motor if turning but it is not moving the fuel. We are not having any issues after the truck is running. Any ideas?????
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Jeff
It seems like the longer the truck sits before starting, the worse the problem. If you start the truck after sitting 4 hours, there is usually no issue. But if the truck sits for about 12 hours that’s when the problem starts. There is no smell of gas in the garage so there is not a gas leak. Yesterday when my wife went to start it, she said she tried turning the key on twice and did not hear the fuel pump at all. The third time the pump turned on, but it took about 3 minutes before it shut off. Then it started fine. This morning (after sitting 12 hours), I turned the key, heard the fuel pump for about 2 seconds and all went well. My guess is that there is something flaky with the fuel pump. Either the pump is running but not pumping anything, or the motor if turning but it is not moving the fuel. We are not having any issues after the truck is running. Any ideas?????
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</OJeff
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sounds like the the oneway valve in the pump is failing and all the fuel in the lines are draining back into the tank... only 1 way I know to fix this problem... new pump time, I would recommend spending the extra couple of bucks and getting a pump from the dealer because I know that pump has been updated a few times and the aftermarkets dont usually update....
Elder User
Joined: Jul 2005
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Remove the vacuum hose going to the regulator and looks for signs of gasoline, key on, engine off. If you smell or see any it's leaking. You can go one step further and hook up a handheld vacuum pump and pull full vacuum on it while looking for fuel.
I have to agree with hammy though... it's usually the check valve in the fuel pump itself.
Good luck.
I have to agree with hammy though... it's usually the check valve in the fuel pump itself.
Good luck.
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The fuel pump is turned on buy the pcm( power train control module) the pcm ground the fuel pump relay for 3-5 sec when key first turned to run to prime to pressurelize the fuel line.. the pump is then turned off until engine is crank or key cyled again. If it stays on long then programmed time I suspect you have a bad pcm or the ground wire is at time shorting out to ground. It is possible you may have a bad fuel pump relay??? Poss it has corrision in the connector.. when you have a conition of key turn on and no fuel pump chech for power at the interia switch. You should have power in and out of it for the 3-5 sec when you first turn key to run or all the time during crank.. If you have this power and fuel pump does not turn on you have a bad fuel pump or open circuit to it ... sometime to check the pump you can bang on the fuel tank in the centre bottom while someone is cranking the engine this will jar the pump and it may turn on.. Be safe block the wheel in case is starts
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Well yesterday I put on a different fuel pressure regulator (from a friend at a junk yard). When I started the truck I had no problems, but today when my wife left work, the fuel pump run about 40 seconds before it would start. In addition, the Overdrive light on the dash is now flashing. It doesn’t appear to have problems shifting, but the manual said to get it serviced as soon as possible.
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Are these two problems from the same cause, or is this just coincidence?
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Any ideas?
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Jeff
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</OAre these two problems from the same cause, or is this just coincidence?
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</OAny ideas?
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</OJeff
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Joined: Dec 2001
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From: UT
I think david53ford has a good idea on this. It really sounds like you have some electrical issues, and not just to the fuel pump. Your transmission is fully electronically controlled. The computer isn't controlling the fuel pump properly, and who knows what else is going on.
I think the first thing I would do would be to try to pull codes from the computer. Assuming your '95 is EEC-IV/OBD-1 (the vast majority were), then you can pull codes with nothing more than a paper clip. See Ken00's tech info article at the top of the BII/Ranger forums. On my dad's '95, the EEC-IV self-test connector is under the hood, driver's side fender. Then get a wiring diagram and carefully check the EEC-IV power supply circuits and ground circuits.
I think the first thing I would do would be to try to pull codes from the computer. Assuming your '95 is EEC-IV/OBD-1 (the vast majority were), then you can pull codes with nothing more than a paper clip. See Ken00's tech info article at the top of the BII/Ranger forums. On my dad's '95, the EEC-IV self-test connector is under the hood, driver's side fender. Then get a wiring diagram and carefully check the EEC-IV power supply circuits and ground circuits.
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Well after having the truck at the shop for the last three weeks I still have the problem. We have replaced the power train control module, the ignition control module, the fuel pump relay and the fuel pressure regulator. The problem still persists. Sometimes it works, other times...not.
Any other suggestions before we push it over a cliff?
Any other suggestions before we push it over a cliff?
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David53ford is correct about how the fuel pump operates. The relay cuts the power to the pump after a few seconds. The shutoff time has nothing to do with obtaining a certain pressure. We have replaced the following so far:
Power Control Module
Ignition Control Module
Fuel pressure regualtor
Fuel pump relay
PCM relay
PCM diode
We are still having the same issue. It seems like if the truck sits for about 4 hours, the pump would run for about 10 seconds. If it sits for 8 hours, it will run for about 30 seconds or linger. Yesterday the truck sat outside in the 95 degree heat for about 8 hours, and the pump still ran for about 30 seconds before it shut off. So I doubt
there is something going on with cooling and contraction.
Anyone ever hear of anything similar???
Power Control Module
Ignition Control Module
Fuel pressure regualtor
Fuel pump relay
PCM relay
PCM diode
We are still having the same issue. It seems like if the truck sits for about 4 hours, the pump would run for about 10 seconds. If it sits for 8 hours, it will run for about 30 seconds or linger. Yesterday the truck sat outside in the 95 degree heat for about 8 hours, and the pump still ran for about 30 seconds before it shut off. So I doubt
there is something going on with cooling and contraction.
Anyone ever hear of anything similar???
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