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The fuel pump relay is located in the fuel pump driver module is located in the left rear of the truck. It is not separate and not serviceable. You have to replace the fuel pump driver module to replace the relay.
SOMETIMES IT WILL SPINOVER BUT WONT FIRE THE FUEL PUMP NOT COMEING ON.IT RUNS A COUPLE OF DAYS THEN WONT STARTFOR A COUPLE DAYS THEN WILL RUN A FEW MORE DAYS