G 2500 3/4 Ton Van V8-6.5L DSL Turbo VIN F (1997)
Fuel Gauge: Description and Operation
The fuel gage indicates the quantity of fuel in the tank when the ignition switch is in the "RUN" position. When the ignition switch is turned to the
"OFF," "LOCK," "START," or "ACC" position, the pointer may come to rest at any position.
The fuel gage measures current from a variable resistor inside the fuel tank that Is controlled by a float. When the fuel tank is full and the ignition switch
is in the "RUN" position, resistance is high and the fuel gage indicator moves to the maximum position, or "FULL" on the gage face. When the fuel tank
is empty, resistance is low. The fuel gage indicator moves to the minimum position or "EMPTY" on the gage face. Corroded connections or severed
ground paths generally cause the indicator to register past "FULL" on the gage face. Short circuits to ground generally result in the indicator resting
below "EMPTY".
The fuel gage sender assembly mounts to the top of the fuel tank and is retained by a cam-type locking ring. A seal is used between the fuel tank and the
sender. The fuel gage sender assembly consists of a float attached to a variable resistance sender, a woven plastic filter on the fuel pickup tube, and a
vane-type electric fuel pump.
