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Had a problem like this before and it was the computer..But you could faintly smell something like burnt wires..The computer should be down by the kick panel on the driverside..See if you smell anything on that side
You need to verify that the pump is not getting power,if this is true then you need to see if the fuel pump relay is being powered and if not then check the inertia switch,if it is being powered up check to see if the relay is swithing power to the pump,if not replace the relay,if so you have a broken wire between the relay and the fuel pump,repair as needed
It is in the front seating area, driver side, behind dash, upper corner, mounted on dash with support brackets. I don't think the computer would fix your problem. Does the fuel pump quit running when you remove the relay? It sounds more like a wiring problem, like a wire that should be getting ignition battery, (going to the fuel pump), is getting constant battery. I would check the wiring for the fuel pump relay.
Do you have a fuel guage reading for the rear tank when selected? Unplug the rear tank fuel pump electrical connector and check for voltage on the terminal with the brown/ white wire and the orange wire should be twelve volts. If nothing then measure the orange wire for continuity to ground should close to 0 or .1 ohms. If no continuity between ground and the orange wire then you have an open on the orange wire this needs to be repaired so that when you test for continuity again it is within range. If you have twelve volts now between the connector terminals. Plug the connector back in and try the pump again. If you had 12 volts to begin with disregard the repair above. Unplug the front fuel pump electrical connector and test for continuity between the terminals on the tank that the red and orange wires go to. Record the readings. Now you a baseline of what the rear tank fuel pump should read. Now do the same test on the rear tank between the terminals on the fuel pump where the brown/white and orange wires go. Chances are you'll find out the rear pump it self is bad from not being used for a while.
WHAT IS THE 4 CYLINDER ENGINE COMMING OUT OF? THE 91 f150 IF IT'S GAS HAS A GAS PUMP AND RUNS AT 60 psi The 4 cylinder may have a high pressure pump with a pickup pump on it so need to know in orderto set that up.
I believe you can look up the manufacturer of the trailer plug kit and find the wiring diagram there. On alot of the trailer plug kits, they have pics and diagrams in the package. The 7 pin plug (truck side) is available with the pig tail set up that plugs directly into the wiring harness for the lights. Then all you would have to worry about is the 2 wires for the electric brakes.
I just replaced my fuel filter and check the pump along; I would replace the right wire harness so you don't want any sparks there b/c you might burn your engine since older vehicle tends to leak here & there so be very careful.