1994 Ford F-150 Fuel Pump Power Block Circuit Cold

RBLOME

MEMBER
1994 FORD F-150

Electrical problem
1994 Ford F150 V8 Two Wheel Drive 171000 miles

My F-150 runs a few days then won't start. I replaced the fuel pump which was original and whinning loudly. Ran for a few days and stopped. My mechanic then said no ground from the computer to the fuel pump so he put in a rebuilt computer.
Today it wouldn't start again. I tested the power districtuion box under the hood. At the fuel pump fuse there was no power to the fused circuit. The others around it all have 12 v. I tried all harness connections to see they were tight. Any ideas what I should do next? The power block has a nest of wires going into the back. Do you think it is the block, wiring harness or elsewhere?

3 Replies

RBLOME

MEMBER

Lots of viewers to my issue but no suggestions. I have been thinking about it. If the issue is no power at this breaker slot. Why not use a wire and just tap 12 volts from a neighboring non-crucial slot like the radio slot and feed the cold breaker slot for the fuel pump. I think I will try it. It is sure cheaper than a new wiring harness and power distribution box. It would certainly be a way to test if this makes the vehicle run.

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Tuesday, December 4th, 2007 AT 7:48 PM

RBLOME

MEMBER

Jumping didn't work. I had it towed to a Ford garage. I'll post the solution.

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Wednesday, December 5th, 2007 AT 9:25 PM

RBLOME

MEMBER

The Ford shop knew what to look for. The 94 F-150 was designed for two fuel tanks. I had just one. There is a wiring harness under the dash with a bypass of some sort plugged in if there is no switch for two tanks. The end of the plug had shorted and fused. Why it was intermittent I can't explain.
But this solved it. We were all looking under the hood and around the fuel tank for the problem when it was deep under the dash board. Now we know. I hope someone else with this issue finds this post.

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Tuesday, December 18th, 2007 AT 8:07 PM