Anyone have a wire diagram for the fuel pump (stock, HFCM) circuitry ? I am trying to troubleshoot no voltage to the pump and I need to know the flow between the relay, inertia switch, etc...Thanks in advance !!
I should mention that those diagrams are for a 2004. If your truck is NOT a 2002-2004, then the wire colors and connector numbers will probably be the same, but the fuse numbers will definitely be different.
2004 F-250 SD, 4x4 FX4, 6.0L PSD
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Thanks so much, so it looks like the relay in the junction box is definitely before the inertia switch. So if I have power at the inertia switch it is safe to say that the relay is working. I must have a bad connection somewhere between the switch and the pump...
THANKS to everyone for their help...turns out that I screwed up and had the wrong connectors on the WIF sensor and pump . They will seat incorrectly even though they are keyed. I checked the voltage at each plug when first installing but hadn't realized that the inertia switch was tripped when I did. With the switch tripped, I saw some voltage at the black plug and nothing at the gray so had figured that there was low voltage to the pump and the WIF sensor was just an open or close switch. WRONG. Wiring diagrams with wire colors showed me where I went off track. Much better now...
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