How to completely rewire a fuel pump system in a 1989 S15 Jimmy with a 4.3 tbi
 

I bought my 89 Jimmy a couple years ago and looked at the fuel system last year to replace it, it would be easy if there was some old wiring to go off of, but there is nothing, and I can’t find anything on the internet on how to wire it. I have the new sending unit and pump, it just confuses me how to wire it up to the fuel pump relay and if any fuses are needed between there, if someone could run me down the whole process that would be great.

What happened to all the old wiring? Did somebody strip it all out?

Yes that is what I’d assume, and I can’t find anywhere on the internet that shows the wiring diagram or a video of where the wires run.

Maybe head to a junk yard, find one around the same age, and trace out the wiring there?

That’s my next option, just wondering if I could get some help here in the meantime.