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Q: fuel pump relay on 2008 Ford F-350 Super Duty

where is the relay located?
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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.
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