How do I locate a fuel pump short? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-29-2008
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How do I locate a fuel pump short?

So, every several weeks or so, I am driving and suddenly my engine will lose all power and stall. Luckily, I can feel it happening, push in my clutch and can coast off to the side of the road. First time it happened I was doing about 70 in the fast lane on the freeway. Anyway, I figured out it was a blown fuel pump fuse, and it keeps shorting out every so often. Any ideas on how to go about locating where this short is happening? I keep a bunch of spare fuses in my truck so when it happens I can throw a fresh one in there and be on my way. But it wont go away on its own.
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Old 04-29-2008
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It sounds to me like the insulation has rubbed off part of a wire and it keeps grounding out. Since your problem is speratic and not consistent, the best way would probably be visual inspection of the wires, look for anything out of places.
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Old 04-29-2008
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where would I look? Where is the fuel pump on the truck? (04 Ranger Edge, V6, 4.0, 2x4, manual)
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Old 04-29-2008
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The fuel pump is in the tank. Hopefully it is not shorting there or you could end up with a very serious problem. You basically have to inspect the wire as said before. Look for a worn area in the wire insulation.
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Old 04-30-2008
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My 1999 motorcycle started having a dying problem. I was doing 65 one day and it died. I turned the key off waited 60 secs and it started and ran fine. Another time I was doing 45 and I did the same thing and it ran fine. I was doing 45 and it died and would not start. The first 2 times the dealer could not pull any codes. The last time no codes showed but they swapped out the ECM and it has been fine for years.
My 2003 started having a problem with it dying on bumps. It would die and then start right up again. The Mech found a bad battery cable. There were broken strands under the insulation. It took 3 days to find and then it was by luck. I stopped in and asked how it was going. He is a young but very good mech. He was all bummed out he could find the problem. The manufacturer only suggested things he had already checked. He said, "The first day I grabbed all the wires to make sure they had good connection." As we talked he started pulling on wires and the bad cable was in his hand. It finally snapped in 2 when he grabbed it that time. Pure luck.

Hope you have better luck.
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Old 04-30-2008
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First, do a thorough visual inspection of the wiring harness from the connector under the cab back (the wire might still be PK/BK). If you don't find anything, disconnect the connector under the cab, clean it, inspect its pins, apply dielectric grease and reconnect.

Last, pull the bed or drop the tank and inspect the connector where it goes into the top of the tank.

You haven't spent any $$ yet, so either throw a $12 Fuel Pump relay at it or swap it with one just like it. I'd do one or the other before I pulled the bed off.

Only things left are the ground, which is probably common with other subsystems, the inertia switch, which appears to be good, and the pump assembly itself.
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Old 04-30-2008
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On my 99 the wiring rubbed the cab floor it cause the pump to short out. It was the seat bolts actually. It was just out of sight above a piece of black plastic that holds it up out of the way.
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Old 04-30-2008
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Good info, Im gonna look into that stuff, thanks!
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Old 02-12-2014
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I am haveing promblems with my 1999'ranger blowing.fuses ive changed the fuel.pump.and the relay ive checked wires plug ins ive even put a brand new fuel.pup.in what else could.be the promblem
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