Join Date: Aug 2016
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If your talking about the switch for the front and rear fuel tanks -
The solenoid is mounted underneath - on the frame, drivers side - about where the bed and cab meet.
When you select a tank from the rocker switch on the dash (Front - or - Rear) the solenoid moves to change which tank the fuel comes from (and returns to)
The solenoid has 4 fuel lines connected to it.
1 "pair" go to the front tank (suction line and return line)
the other pair go to the rear tank.
The solenoid "closes" one pair - as it "opens" the other pair.
2 each - Stock - 97 F-350 7.3 PS 1 ton Duallys - RWD - AT