Hello, The fuel pump relay gets current from the inertia switch, the
inertia switch on my 1991 Ford f-150 was on the firewall under the
carpet, near the clutch pedal. It has been reported that the
electrical connections can be either burnt and or corroded, and/or
both at the switch, my truck had neither. I would reccomend replacing
both the fuel pump relay and the computer relay at the same time. I
replaced just the fuel pump relay, the truck ran better, but not
completely. I then replaced the computer relay. Then bingo, all is
good. Good Luck!
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