F 350 4WD Super Duty V10-6.8L VIN Z Bi-Fuel (2001)
Fuel Tank Switching Valve Relay: Description and Operation
NOTE: The descriptions and specifications contained were in effect at the time this information was approved for printing. Ford Motor Company
reserves the right to discontinue models at any time, or change specifications or design without notice and without incurring obligation.
Dash Reset Relay (F-Super Duty 350)
The dash reset relay allows for more accurate display of fuel level when switching from one fuel source to the other. Use of the dash reset relay
prevents fuel gauge floating, incorrect level reading or slow fuel gauge response.
Tank Valve Select Relay and LPG Level Sender Select Relay
(F-350 Super Duty dual LPG tank option only)
The tank valve select relay and the LPG level sender select relay are controlled simultaneously and are used to toggle power to either LPG tank one or
to LPG tank two when the ALT fuel system is in operation. Both relays default power to LPG tank one until the dual ALT/GAS switch is in the
secondary ALT position. The ALT/GAS switch then provides power to energize both relay coils. When the relay coils are energized power is
disconnected from LPG tank one and switched to LPG tank two. The tank valve select relay toggles system power between the LPG tank lock off
valve while the LPG level sender select relay toggles between the LPG tank fuel level sender return circuits connecting one or the other to the
Compuvalve input.
