fuel tank switching valve

[hayisforhorses]

Been wrenching on old yeller this weekend and check out both fuel tanks pick up and they were both great next was checking over fuel lines and found that they hacked the lines off the switching valve and went direct to the front tank. Done some thinking and talked to some local ford guys and was told there was an old recall for the valves that was basically due to the fact you could be running off one tank and it could return to the other tank overfilling it, so I think this was their northern redneck fix . The valve sound like it is actuating fine only problem is I need a diagram how to plumb the lines also the lines are plastic do I need to replace them all or is there a way to splice them reliably? Anyone heard of the overfilling issue? I have asked allot of questions here in just a short time and I have always been given great advice!!! Many thanks to all the knowladgeable people here willing to share

 

[franklin2]

I don't have a diagram of how the lines go, but you may be able to take a air nozzle or just blow through the valve to see what is connect to what in the front position and the rear position.

I would go to standard metal fuel lines were possible, but in certain places where I had to use the plastic line, I used a heat gun to warm the steel line up, and then slipped the plastic over the steel line and then used a small hose clamp. Seems to work ok.

 

[dakotajeep]

Dont use to much air pressure to check the tanks.

I used rubber fuel line and they have held up fine.

Thad

 

[maxdiesel]

Here is a diagram of an aftermarket pollack selector valve. The original is plumbed the same way

 

[hayisforhorses]

Have been thinking about this issue and has anyone just run an electric pump from the second tank into the first tank and run it on a toggle switch from the dash? Both sending units for tank level are still available so you know your levels in each tank and then you do not have to worry about the selector vale failing again and you have the fuel capacity of a 2 tank truck and the electric transfer pump would last a long time being used intermittently just a thought. This would also leave the fuel lines that are pypassed andf hacked away direct to the front tank alone without adding rubber over plastic and worring about creating a spot for air intrusion.

 

[jcarr]

The return problem I've experenced is the front tank returning to the rear tank. I've not had this problem YET on the squirrel mobile but have had several gassers that have done this to me. My fix was to fill both tanks and use the rear tank first. Then the front and near the end of the front tank I could switch back to the rear tank and have around a 1/4 tank. Never had any overfilling probs using this methoid.

 

[Agnem]

Technically, this should not happen since the valves are mounted to a common shaft and move in unison. However, they do have seals which I suppose if they were to leak could allow fuel to go where it shouldn't.