I have a 86 silverado that needs the power wire ran from the tank to ?? I dont know where this goes. Someone has removed all the wiring leading back to the tank. If anyone can help I would appriciate it.

disconnect the pump by the tank and put power directly to the wires to check it. You should hear it whining. If you do. the pump works. next check the pressure at the engine, you may have a plugged filter. if you find the wires from the front to back of the car has no power after checking for power on all components, ( the relay socket should have power on 2 sockets when the key is on) make sure this is so. If its not you need to make sure you get power on terminal marked 30 on the relay and either 85 or 86 (one will be ground the other power) if all that checks out you have a wire broken leading from the relay to the fuel tank.

This is either a wiring loom issue or a ECU issue.

i wouldent even atemt to fit them as if they are not powerd in your the whole car seat mekanisem will have to be wired in new harnesses relays into fuse box new door cards for the seat buttons to go into you could just do a botch job as long as the switch has power ypu just take the wires to what ever motor they run but it would not be a proper wiring lomb if your not an auto electrision dont bother

The diagram below should help.

it may have a automatic fuel shutoff switch on it

I would suspect the fuel pump.The fuel pump is in the tank and I would just change it then set your timming back to the originale timming.

Take all remaining wires and "flash" them to a good ground with the ignition on. when you find the one that makes the oil pressure gauge move, that's your wire. Do not make a solid connection when doing this or you can damage systems served by the "wrong" wires. First look for the wire near the sending unit location...generally the wire leads coming out of the main harness are not very long. The problem with most schematics is that often they get the color wrong or they tell you a wire is there but don't say where "where" is. Also, if a fuse blows when flashing the wires, make a note of what wire went to that fuse (system) it will help with later wiring.

How to set up radio without wiring diagram : First you need to hook up the lead and ground power wire to your radio.(the lead usually has a line all the way down it). Turn power on to the radio and switch to am/fm. Locate any lead speaker wire and connect it to front right -. Then take all ground speaker wires one by one and touch them to front right +. As soon as you hear a sound, find out which speaker it is coming from, as soon as you have identified correct speaker remove wires from right speaker and mark them carefully. Do this with the rest of speaker lead wires an speaker ground wires and you will be able to connect your stereo.

Sounds like either pump/wiring, or connector on top of the pump unit. My best advice would be to drop the tank and check for voltage at the fuel pump wires (power and ground) for a short period of time when you turn the key on (Gray wire/ black wire on the 4 pin connector) If you moved the wires and it worked it definitely points to a bad wire close to the tank or loose connection on top of the tank.

i ran into EXACTLY the same problem on an 86. i kept forkin' around and finally went direct to the starter and bingo it started. to this day it is still working and never happened again. i have absolutely no idea why. by the way--that was almost 2 years ago. might also be corrosion between the battery cable @ the starter, and the wires that go to the waring harness.