i have a 85 one ton pick up with dual tanks. about a month ago my fuel guage quit working. well the tanks were still switching. just the guage was the problem. then i ran out of gas one day and i figured out that it was no longer switching tanks. well i ran the truck for another month and then it acted like it ran out of gas again. now my pump is no longer running (electric pump). i changed the switch in my dash so it is fine. but i cant figure it out. i believe my pump is good but what im wondering is there another switch and if so where? i very confused any suggestions would be appreciated.