Finally getting around to replacing the fuel tank selector valve (2-50gal).
I've noticed that regardless of individual quantity levels at fill-up time, they will equalize to the same amount when parked over time....stuck valve was my first guess, considering that they're probably original.

Crawled under to get a good look, maybe a part #. To my surprize, I don't have a selector valve....I've got TWO of them (both 3-port). They're wired in series to my
double throw switch on the dash, so both activate/de-activate together.



Is it possible that one is for feed from the tanks, and the other is the mechanical fuel pump's return line, thereby sending surplus fuel back to its original tank?

I really don't want to "Pull-A-Steve" and spend days under the Barth tracing lines so if someone has an explanation, I'd love to hear it!....Thanks.....

quote:

Originally posted by Lee:
Is it possible that one is for feed from the tanks, and the other is the mechanical fuel pump's return line, thereby sending surplus fuel back to its original tank?

Most likely Lee, this is what it does. Makes the most sense to me. I kind of remember seeing something like this Jim and Tere's coach. Check with Terry, as I think she was the one who dropped the tank.

Haven't looked at our '77 system for awhile--- but I think how ours works, is, one controls where the fuel is taken from and the other controls where the return fuel (excess) is sent.

Bud

There is an electric valve that does it all. Has 6 nipples. I think Pollack makes it.

Thanks for the feedback guys....The plumbing is like ya'll said it would be: one valve chooses the tank and the second valve routes return fuel back to original tank.

Genaric 3-port valves are about $35.00/ea, the route I chose to go. Their limitations are about 10psi so they recommend against use with in-tank pumps and/or EFI systems. Also, because they're solenoid-based, they draw constant power in one of the two switch positions.

As billH suggested, you can also go the high-brow route with a 6-port valve. Benefits include a motor driven design, so no constant power loads except for the nano-second it takes the motor to switch ports, and 60psi +/- limitations so they can go into about any system.....$100.00+/- seems to be the going rate.....

Another project done.......only about 200 to go.......