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Fuel Gauge Sending Unit Test

  1. Remove fuel gauge sending unit from fuel tank. Move float to highest point and measure height between point "F" and sending unit cover flange. See Fig 1 . Move float to lowest point and measure height between point "E" and sending unit cover flange. Replace sending unit if readings are not correct. See FLOAT HEIGHT SPECIFICATIONS  .
    FLOAT HEIGHT SPECIFICATIONS

    Measure Point Height
    FWD
    "F" 1.69-1.89" (43.1-48.1 mm)
    "E" 6.9-7.06" (175.5-179.5 mm)
    AWD
    "F" .84-.96" (21.3-24.3 mm)
    "E" 7.84-7.96" (199.2-202.2 mm)
  2. Use ohmmeter to check resistance of fuel gauge sending unit. Measure resistance between fuel gauge sending unit terminal and ground with float at points "F" and "E". See Fig 1 and Fig 2 . See FUEL SENDING UNIT RESISTANCE  . Ensure resistance changes smoothly when float arm is moved slowly between points "F" and "E". Replace sending unit if readings are not correct.
FUEL SENDING UNIT RESISTANCE

Measure Point Ohms
"F" 1-5
"E" 103-117
Fig 1: Measuring Float Height
G91D07786Courtesy of CHRYSLER MOTORS.
Fig 2: Measuring Fuel Gauge Sending Unit Resistance
G91H07788Courtesy of CHRYSLER MOTORS.