Fuel pump 12volt supply

[bigblockchevelleman]

 I am currently doing a complete rebuild of a 1987 chevy Silverado  I had the 350 rebuilt and it's going back with a carburetor the truck has the dual saddle gas tanks there is 4 wires that run up the frame two go inside the cab the other 2 are in a connector tan and gray when 12 volts applies to the gray wire 1 fuel pump will run nothing on the other wire ( tan) my question is I don't remember where they plugged in any help would be great THANK YOU!

[VileZambonie]

We call that regression.

http://forum.73-87chevytrucks.com/smforum/index.php?topic=9072.0

[bigblockchevelleman]

Thanks but unfortunately I already have those diagrams I was hoping someone would know exactly where the electrical plug was originally plugged in the wire harness I wish I could post the pictures because even following the wire diagram I would wind up wire wires unconnected  if possible we could speak on the phone I can send you my number  sorry for any misunderstanding I believe you have helped me before the truck sat for a while with things apart then I had some health issues Thank you very much for your time and help

[VileZambonie]

Look at this diagram. The grey wire goes to the right hand fuel pump from cavity E of the tank selector valve and to the fuel tank selector switch in the dash. The tan wire goes to the left hand fuel pump from cavity D of the tank selector valve and to the fuel tank selector switch in the dash.

[bigblockchevelleman]

Guess I've confused enough and really have been good with electrical things so if  I cut the wires one splices into oil pressure switch on back of intake and the other wire splices some where else  , Thank you for the help Steve

[bigblockchevelleman]

Here's a photo

[bigblockchevelleman]

I don't remember where they plugged in and do I splices them or omit them they run back to the tank
Splices this is where I'm confused the most Thank you for the help Steve

[frotosride]

1)There's one plug that comes up from the driver's side frame rail.
2)Just above the driver's valve cover there's a small grommet with 3 wires leading out of the firewall(from tank selector switch), two of them are in the weather pack connector you're looking for and plug into the previous mentioned harness.
3)The third wire is separate with its own connector (tan/white) plugs into a (tan/white) wire leading from the fuse box bulkhead fitting. From there it goes through it's fuse, back out of the bulkhead fitting in the engine bay and to the relay on your firewall. This is the power (+12vdc) to the fuel pump.

If you cannot figure it out then use this link and scroll through the my pics...you'll see it there.
https://photos.app.goo.gl/ceiXHQHm2d381iEb7

[bigblockchevelleman]

Thank you

[bigblockchevelleman]

The wires in the picture run up the frame with 2 other wires that go inside cab the other connector  (picture above  ) they are in a connector it just been a while due to a stroke and I have forgotten where they plugged in I took tons of pictures but my luck this wasn't one of them Thank you for your help

[frotosride]

Did you figure it out?

[bigblockchevelleman]

Didn't get to work on the electrical part because exhaust parts come in and the exhaust system needs to be on so so when I finally do figure it out I can start the truck and break the cam in hopefully tomorrow I can work on it , Thank you I'll let you know when I dom

[bigblockchevelleman]

Wouldn't happen to have a diagram of what the electrical symptoms are Thank you

[frotosride]

Not sure exactly what you're looking for but have you searched through these?

http://forum.73-87chevytrucks.com/smforum/index.php?board=50.0

[bigblockchevelleman]

I searched so much that I sometimes work on something else just to get a brake mainly wanted to know exactly where the electrical plug in above picture originally plugged in