Dual fuel tank selector

[bikernut]

Can any one tell me if the above Selector Valve has power to it all the time or just for a short bit when you first turn on the key to pressurize the system and then after the engine starts the low oil pressure switch engages and powers it? I have one that seems to do that but I think the selector valve is junk as now the right tank won't work unless I disconnect the left side and jump to the right tank. I also can't find out where it gets it power to work the selector valve.
Can anyone give me a part # for the selector Valve or are they available from a parts store? any one know what they sell for? Do any of you guys have a good wiring diagram that you can copy and send me of this truck with dual tanks, I have purchased 2 books now and the wiring diagrams are junk, don't show much and I would like a more detailed look at the wiring system. This is a 1987 K2500 with a 350 V/8 and 400 tranny. thanks in advance for any help!

[tvblazer78]

I think you can get more help over here. Good luck..

[MJN]

The dual tank valve on my '74 is the single wire valve. Power is sent to the valve when it's switched over to the left tank but the dash switch gets power from the key. If you have the switch on the left tank and turn the key to ON you can hear the valve kick over. The sending units are controlled the same way, through the switch when the key is turned on. I'm not sure on the newer 6-wire valves.
I had to get mine through the GM dealership. They could get the 6-wire valves as well.

[rustyescott]

just bought one today . paid $14.60 from oriely's