where is the relay located?
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2008 Ford F-350 Super Duty Question: fuel pump relay
Answer #1patrick mannion from Greg Solow's Engine Room, March 09, 2011, 21:27Master
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Answer #2DaveJHM March 09, 2011, 22:59Master
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.