2008 Ford F-350 Super Duty Q&A
2008 Ford F-350 Super Duty Question: fuel pump relay
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In the battery junction box under the hood, the fuel pump relay is the 3rd of the smaller relays, about halfway left to right, at the top. What problem are you having? This vehicle supplies fuel via a sending unit to the high pressure fuel pump, which supplies fuel to the injectors directly. I have not seen any faulty relay issues with the 6.4L. - DaveJHM
So The pump is connecting positively, but the negative is not connected to the ground its going into the relay or computer!!
it only lasts 30 min when i drive the truck