87 F-150 fuel pump problem
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Joined: Aug 2004
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87 F-150 fuel pump problem
My frame mounted fuel pump quit working so I checked power to it and there was none. I disconnected both wires to it and ohmed them out. They both showed a direct short to ground. I then disconnected the wire connector under the hood and ohmed it again. The pink hot wire was ok then. Do I have a bad relay or could the problem be in one of the fuel tanks low pressure pumps?
P.S. it's an 87 F-150 extended cab with a trailer tow package and a second fuel tank. It has a 302 engine and fuel injection.
P.S. it's an 87 F-150 extended cab with a trailer tow package and a second fuel tank. It has a 302 engine and fuel injection.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
Just to be sure you know, the fuel pump wire will only be hot for 2 seconds after the key is turned on if the engine is not running. Can you hear the in-tank pumps come on with the key? I think that when a relay is plugged in, you will get some funny things to happen with the volt meter. I don't know why, but I ran into a similar problem when I wired our race car at NC State this past spring - I was testing the switches, and I couldn't detect the switch with the voltmeter - it was always a complete circuit. If there's no short to ground with the relay unplugged, I would think the wiring is ok. If the other fuel pumps work, then it is probably time to just replace the high pressure pump.
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problem solved
Thanks guys for the immediate response. I found a corroded heavy yellow wire under all the connectors under the hood. At first it seemed to feed the tow package relay, but by following the wire a ways, it was spliced onto another yellow wire. which must have been to the fuel pumps. After replacing the wire, the truck started and ran fine. You guys are the best.
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