The WW2 Willys MB and Ford GPW fuel tank sending unit mounts to the fuel tank under the driver's seat. To access and replace the sending unit, remove the driver's seat frame with 5 bolts. Use appropriate caution when working with equipment in the vicinity of gasoline.

The sending unit is a variable resistor. The full-tank resistance of a good unit is from 7-9 ohms. The empty-tank resistance of a good unit is from 130-140 ohms. The sending unit should have a smooth linear increase in resistance from the full to the empty positions.

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