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Repair guides and support for the eighth generation of Ford F-Series trucks: the F-150, F-250, F-350, and F-Super Duty.

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Fuel pump power/wiring

I have a 1989 airex airmax motorhome. It's on a f35 chassis, Ford 460 engine and a 30 gallon tank.it has a pump in the tank and a inline pump near the engine that connects to a filter then goes to my fuel rail.

My intank pump went out awhile ago and I replaced it however I cant get power to it through the wiring harness when I turn my key.

The harness has 3 wires, one positive for the pump, a ground, and the wire for the floater. None are pulling electricity.

I know I can wire the pump to my rvs big battery on the side and attach a toggle switch so I can turn it off, but I really don't want to unless I have to.

Where would I start diagnosing the problem? Ignition sequence? Redo the wiring harness with fresh wires and dressing?

You tell me America

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@victorphil78106 no power to the pump could be the fuel pump relay. The relay could be mounted on the air cleaner support bracket. It could also be in the fuse box :-) Sorry for being non-committal on that, but those years were a bit of a beast. Anyhow, here is the fuel pump control circuit and description for the 1989 Ford F series. Of course, make sure that you also check your fuses as well.

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2 Comments:

Fuel pump relay is fine, dunno bout the ECC one though. I'm in the process of wiring both the inline and intank pumps with new wire, to my starter solenoid. Or.... In theory I could wire the in tank since it's the problem child to my external big RV battery with a toggle switch to turn it on and off right? Just need the right gauge wire.

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@victorphil78106 why not just run power to the relay? See if bypassing the ECC gets the pump to work. Find a fuse that gets power as soon as you turn the key. Run a jumper from that to the relay.

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