OK folks I need your help. I have been beating my head against the wall and I'm about to go into a coma.

I replaced a fuel selector valve and had to replace the electronic connection plug. I canthink for the life of me can't get the gauges to work. It just pegs out. I followed the instructions and wiring diagrams and aids. I can't figure it out please help.

1985 f350 4x4 7.5

Thanks for the help

 

Yellow/White wire to gauge from valve terminal #4 open/not connected ?

Also check the upstream connectors...

OEM Selector Valve? I guess not if you had to change the connector....

 

Take the yellow white wire, and with the key in run, engine off, ground the yellow/white and then take it off ground. Each time you do this the gas guage should swing full scale full to empty. It's a little slow so give it some time to make it.

If the above test works, you know the wire to the valve and the gauge up front are all working.

If you want to test the fuel sending units, take the yellow/white and temporarily tie it to the darkblue/yellow, that will be for the front tank. If that works, you can then tie it temporarily to the yellow/lightblue, that will put it on the rear tank.

 

Good stuff Dave....

I think he has an aftermarket Valve, he may need to post the New wiring diagram, or provide the make and model of the New valve.

 

Thanks folks it is an aftermarkt but the only one I can find.

The factory wires are.

Yellow w/blue stripe
Yellow
Dark blue
Brown
Orange.

Thanks again

 

The pdf for the Pollak 6 port valve is available here: Light Truck 6-Port Motor Driven Valve On Pollak

This is the same as all the reboxed Wells, Store Brand, whatever, 6 port switching valves.

 

Look closer. When the wires get old, it's hard to see the colors. The first color listed is the primary wire color, the second color listed is the stripe.

Yellow w/blue stripe = Yellow/lightblue = rear tank sender

Yellow = Yellow/white = wire going to gauge up front

Dark blue = Darkblue/yellow = wire going to front sending unit

Brown = Brown/white = wire going to motor in valve

Orange. is correct. = wire going to motor in valve

 

Please provide the make and model of the New valve.

 

If it is this make.....