bypass tank selector valve?

[Skunksmash]

If it were me I'd buy the new valve. And go ahead and fix it all. Its very nice having two tanks. When you go to fill up, you don't have to worry about getting turned around right at the gas station. Plus you can always leave 1/8th of a tank in the opposite tank, just in case. And alternate when feasible so that the fuel doesn't get a chance to go bad. Or you can fill up both and go 500 miles before you need to do it again. Lots of little advantages to having both tanks working.