One problem related to auxillary tank has been reported for the 1997 Ford F-250. The most recently reported issues are listed below.
Contact owns a 1997 Ford f250. He said the vehicle started running rough so he took it to the shop, and they cleaned his fuel injection. The truck has two fuel tanks. The front fuel tank completely quit working the rear tank worked. Now he says that the rear tank keeps on filling the front tank with gas and there is so much preassure from the tanks that gas just starts running down the side of his vehilce and when he opens the gas cap fuel starts squirting out he said it would squirt out about a half gallon of gas. His smog checkedwas do last week and since his check engine light came on they will not do the smog. The dealer said he was missing a check valuve between the fuel tanks and the dealer told him both fuel pumps had to be replaced.