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Sounds like the relay has gone bad (common problem on these trucks) there is no rebuild so you have to replace it (around $10) located under hood, passenger side, by air cleaner you'll see a bank of little "boxes" the fuel pump is the green one. Just go to your local parts store to get the replacement. You just unplug the old one, and plug in the new one. Do make sure the key is OFF when you do it.
your fuel pump is supplied voltage from the fuel pump relay which is supplied voltage from the EEC power relay ( fuel pump relay-Green Base, EEC power relay has a Brown Base) usually located on the left side(drivers side) of the engine compartment. These relays are supplied voltage from the fuse links at the starter solenoid on the firewall near the Battery, I hope this Helps Don!
replace the oil sending switch on the motor. upon starting the engine this switch has a 3rd wire connected to the fuel pump
when oil pressure is running at its normarl psi the computer will shut that circuit off and then turn on the fuel pump relay
The relay is located on the cab on the drivers side. Locate the fuel pump inertia switch up against the firewall. Check and see if you have a fuel shut off switch in the trunk of your car. It should tell you in your owners manual. you can see if you have power there when you turn your key on. it only powers it up for 4 to 5 seconds