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Old 12-30-2005, 10:43 AM
darrengj darrengj is offline
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1998 ford explorer 4.0 blown fuel pump fuse

The fuel pump fuse on the explorer keeps blowing when I try to start it. Where should I start looking?


Thanks,
Darren
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Old 12-30-2005, 02:09 PM
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marragtop marragtop is offline
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You can try replacing the fuel pump relay, but I'm not sure if a faulty relay would cause the fuse to blow. Normally, a faulty relay just results in the pump not running.
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Old 12-30-2005, 02:32 PM
87 XLT 87 XLT is offline
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Heres how a 97 is wired, yours is probably the same: PDB fuse 3 to relay to inertia switch to fuel pump. Try opening the inertia switch & see if a new fuse blows.
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Old 12-30-2005, 09:39 PM
darrengj darrengj is offline
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thanks, i will test out the fuse with the inertia switch open and closed tomorrow.


Darren
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Old 12-31-2005, 11:51 AM
darrengj darrengj is offline
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Question

Quote:
Originally Posted by 87 XLT
Heres how a 97 is wired, yours is probably the same: PDB fuse 3 to relay to inertia switch to fuel pump. Try opening the inertia switch & see if a new fuse blows.

I opened the inertia switch and put a new fuse in, then turned the key on. The fuse did not blow. I then closed the inertia switch and then turned the key on and the fuze immediately blew. I am assuming now that there is some kind of wiring problem after the inertia switch, or the fuel pump itself.

I do not have a manual for the Expy, does anyone have a wiring diagram for the fuel electronics?

Thanks,
Darren
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Old 12-31-2005, 12:31 PM
87 XLT 87 XLT is offline
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The 97 EVTM shows from inertia switch to fuel pump is wired pink/black stripe.

Theres a connector that appears from the diagram to be under the drivers side floorboard.

If you open that connector & a new fuse does'nt blow, theres a short in the PK/BK between there & the pump or possibly the pump is locked up.

Have you tried giving the gas tank a good whack with your hand? Sometimes that will bring a bad pump back to life temporarily.
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Old 12-31-2005, 12:46 PM
darrengj darrengj is offline
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I will try opening the connector first. I will also try a whack on the tank.

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Darren
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Old 12-31-2005, 02:13 PM
darrengj darrengj is offline
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how many wires go into the connector and how many come out? I found one that is grey, but I am not sure if it is the right one.

Darren
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Old 12-31-2005, 07:03 PM
87 XLT 87 XLT is offline
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Just pink/black, try following the wire from the tank.
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Old 01-01-2006, 12:34 PM
darrengj darrengj is offline
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I found the connector. I disconnected it and turned the key and the new fuse did not blow. Now I am assuming that the pump is bad.

Darren
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Last edited by darrengj; 01-01-2006 at 12:36 PM.
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Old 01-01-2006, 01:55 PM
87 XLT 87 XLT is offline
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Is that connector under the dash or under the floorboard? The wiring diagram isnt clear on that. If it's under the dash, take a look at the wiring where it goes thru the sheet metal to the underside of the truck.

Also there is a connector at the tank with 6 wires that you can disconnect & see what it does.
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Old 01-01-2006, 02:06 PM
darrengj darrengj is offline
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I bought a haynes manual to find the connector. It is located right under the driver side door on the inside of the frame-rail. It has multiple wires going in and coming out of it.

Next I am dropping the tank and will disconnect the connection on the sending unit.

Darren
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Old 01-01-2006, 08:48 PM
darrengj darrengj is offline
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After looking at the wiring I found a bare power wire (the brown and pink wire). It was right before the connector that goes to the sending unit/fuel module. I repaired it and all seems to be working as it is supposed to.

Thanks for your help.


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Old 01-02-2006, 12:42 AM
87 XLT 87 XLT is offline
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Good deal, glad to hear you got it fixed.
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Old 01-02-2006, 12:42 AM
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