Tank Switch
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
More Turbo
Joined: Jan 2009
Posts: 547
Likes: 11
P.S. Please excuse my ignorance but why would a truck with a "single fuel system", whatever the hell that is, need a switch to go from one tank to the other?
More Turbo
Joined: Jan 2009
Posts: 547
Likes: 11
I do not have my truck at this home right now so I cannot go out and look at it but here's what the "1979 Ford Truck F-100 Thru F-350 Series Owners Guide" says about the instruments and controls for the dual fuel tank trucks.
If your vehicle is equipped with dual fuel tanks, the level in either tank may be checked by reading the fuel gauge with the fuel selector switch in the desired position. This switch also controls the fuel flow from either tank to the engine. The fuel valve is energized when the fuel selector switch is moved from FRONT to REAR position, allowing fuel flow from the rear tank. On vehicles equipped with dual fuel tanks, the FRONT position supplies fuel to the engine from the midship fuel tank. The fuel valve is protected by the fuse labeled "AUX TANK SOLENOID" on the fuse panel.
Actually I thought the switch read "AUX" and "MAIN" but this manual calls them "FRONT" and "REAR".
Dennis
If your vehicle is equipped with dual fuel tanks, the level in either tank may be checked by reading the fuel gauge with the fuel selector switch in the desired position. This switch also controls the fuel flow from either tank to the engine. The fuel valve is energized when the fuel selector switch is moved from FRONT to REAR position, allowing fuel flow from the rear tank. On vehicles equipped with dual fuel tanks, the FRONT position supplies fuel to the engine from the midship fuel tank. The fuel valve is protected by the fuse labeled "AUX TANK SOLENOID" on the fuse panel.
Actually I thought the switch read "AUX" and "MAIN" but this manual calls them "FRONT" and "REAR".
Dennis
Tuned
Joined: Jun 2015
Posts: 375
Likes: 3
From: Southern OR
I would think the larger of the two tanks would be considered the main tank if someone wanted to refer to a main tank/aux tank question. Aux tanks are usually smaller than the "main" fuel tank source. IMHO
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