K 2500 Truck 4WD V8-6.5L DSL Turbo VIN S (1998)
Fuel Sender Assembly: Description and Operation
Description
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The fuel sender is located inside the fuel tank and is attached to the top of the fuel tank.
DESCRIPTION
The fuel sender has a float, wire float arm, and a rheostat.
OPERATION
Fuel level is sensed by the position of the float and float arm which operate the 90 ohm rheostat. As the float position changes, the amount of current
passing through the rheostat varies, thus changing the gage reading on the instrument panel.
The electric fuel lift pump mounts on the inside of the left frame rail, and is used to deliver fuel at a low pressure (at least 3 psi or 21 kPa) at the rate
of 0.24 liter (1/2 pint) in 15 seconds (15 GPH). The lift pump is controlled by the PCM.
