Grand Cherokee 2WD L6-4.0L VIN S (1997)
Fuel Gauge Sender: Testing and Inspection
Testing
FUEL GAUGE SENDING UNIT
The fuel gauge sending unit contains a variable resistor (track). As the float moves up or down, electrical resistance will change. To test the gauge
sending unit only, it must be removed from vehicle. The unit is part of the fuel pump module. Refer to Powertrain Management/Fuel Delivery
and Air Induction/Fuel Tank Unit/Service and Repair for procedures. Measure the resistance across the sending unit terminals. With float in
up position, resistance should be 20 ohms. With float in down position, resistance should be 220 ohms.
See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Tank Unit/Service and Repair
