[PHOENIX]

While looking into this a bit it seems my switch valve is not working correctly.
Is it possible for the return gas to go into the switch and send returned gas to both tanks?

When the switch valve stopped working years ago I had $7 worth of gas in the passenger tank. I couldn't switch to it so I just left it. Both gas tank vent lines go into a Y near the switch valve then go to the canister. So if one line has gas in it they both will. This is where the leak at the switch valve was coming from (the vent line Y connection). I decided to see how much gas was in the passenger side tank, which should have maybe 8 gallons. Nope! it had somewhere around 14.5-16.0 gallons. The tank was basically full. So somehow gas has been getting in the tank I don't use and building up, then filling the vent line, because it is lower then the fill hole. The question is how did the gas get into that tank. I have not taken the switch valve apart yet, but I am guessing that the return gas ports are somehow being shared and both tanks are receiving the returned gas. Because I never use the one tank its getting full and causing my fuel leak and gas in canister problem. But if the switch valve was doing this wouldn't it suck gas from both tanks too? Is there a little o-rings in there and maybe only the return side went bad?

How can I hook the switch valve directly to the battery to determine if it is good or not? My tank selector switch inside the cab is new, so I think it is working. When I get under the truck and plug the switch valve in and have someone hit the switch I hear a click, but the little bars inside the switch valve do not move. This is why I believe the valve to be bad and not the switch. But if someone knows which wires to hook directly to the battery to test it direct I would really appreciate it.

I thought I would need to remove the tank I haven’t been using and clean it well before I use it again. But when I was siphoning the gas out of the tank it only picked up a few little particles. I was really surprised I thought there would have been more in there it was almost nothing. Do you guys think it would be ok to go ahead and fill up this tank and use it?

Where is the best place to buy a replacement switch valve?
I remember them being expensive so I might no purchase it right away. I want to make sure this is the problem (and only problem). I plan to hook up the driver's side tank directly (as if I only had one tank) and drive it like this for a while to see if I still get gas in the vent line. If there is a heat problem causing the gas to expand the problem will only be present in the drivers side tank because that is where the exhaust pipe runs by. I don't think this is the problem, but I want to make sure.