adapting two tank setup in single tank truck.

[cjlinkster]

The most common problems seem to be that the switch stops working or the selector valve doesn't work completely. I have noticed on my truck; that if the switch doesn't work (my switch is set for the drivers side) then the passenger side tank is used by default. Another member posted the same issue with his truck.

If those two parts are good usable units, then what you need now is just a wiring diagram. Just search on this forum for a diagram for the selector valve.