Fuel pump relay

Asked by Jul 19, 2017 at 11:02 AM about the 2004 Ford F-150 FX4 Ext. Cab 4WD

Question type: Maintenance & Repair

I believe my fuel pump relay is bad. Truck will crank
but won't start. Cannot hear pump running. I ran
power to the fuel pump and got it started so I
believe it's the fuel relay. I'm seeing that some
people are saying this year truck the fuel relay
switch is soldered into the fuse box and isn't
interchangeable. Is this true? Do I have any other
options than buying a new fuse box? New fuse box
costs 400 from the dealer

3 Answers

550

At the relay, unplug it, is terminal 30 hot, with engine cranking, It should be. If so, you can use jumper wire between terminal 30 and terminal 87, the fuel pump should run. If it runs that usually means the problem is on control side of relay, voltage and ground. The two top wires in diagram are voltage and both fuse protected. The voltage comes from pcm power relay. I'd want to check voltage and ground circuits for the relay before replacing. Just my opinion.

The 2004 relay is hard wired into the fuse box. So I cannot take it out. I spoke to another person who told me that if I have power on 32,33,34 with the key on, then my relay should be fine....I've changed the driver module and couldn't get it to start. I put power to the pump and got it to start. Cannot figure out what the issue is..

By the way I did have power to the 32,33,34

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