DISCLAIMER: What I give here is advice. What you do, I'm not responsiable for the outcome. A experienced person who has a understanding of electrical and mechanical should perform any major work, if you can't do the job. Just be safe when working with electrical near gas fumes. RockyB
For your hardbody truck, first do you have a haynes or chilton's repair manual for your vehicle? If you do great if not go get one, this will come in really handy. In the repair manual find the wiring diagram for the ignition and fuel pump system. Basically on the 720 series truck I had, I ran a seperate wire from the external pump to the cab, then we found the wire for the radio that only gets power when the key is in the start and run position. We then spliced the seperate wire from the pump to this wire. The radio wire that had power when in the run and start position already had a inline fuse, so we didn't have to worry about that. In your case, look at the repair manual and see what wire leads from the ignition switch to the pump to supply the pump power. Get a test light at a autoparts store for cheap if you don't have one and test the power line to the pump at the ignition switch when the key is at the on/run position. If the test-light lights up well you know that the falt is not there. The next thing to check is the fuel pump relay. I really don't have good luck checking these things, so, what I do the check it is to pull a good known relay out and switch it with the fuel pump relay. Try to then start the truck and listen for the fuel pump to activate(you should hear a humming from the gas tank). If nothing happens then you might picked a bad relay or the wires to the relay might be no good.
For the quick get you going aproach: go underneath the truck and find the wires from the pump going to the front. One wire should be ground and the other is the power wire. Go to the autoparts store and buy some electrical wire for a positive lead. Leave enough of the positive wire from the pump and cut it. The original power wire securely tape it and keep it away from any moving parts. The wire that goes to the pump attach the new wire to it and securely run that to the cab. Now basically you would be doing what I did with the 720 I had. Find the wire from the radio that gets power when in the run and start position and tap that new wire into that wire.(check the manual for the wire) When you try to start it listen to hear the pump activate.
I hope this helps you.
1987 B12 possible JDM RRC swap - Currently has a blown engine
1991 B13 Se-r - JDM swap - finished 12-7-03
Member since August 2000