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Fuel Gauge

  1. Disconnect wire at fuel tank unit. Connect a variable resistor or known good sending unit to wire, and ground other lead or sender body. Turn ignition "ON". With sender at highest position or 10 ohms resistance, gauge should read full. With sender in middle position or 23 ohms resistance, gauge should read 1/2. With sender at bottom of travel or 79 ohms resistance, gauge should read empty.
  2. If panel gauge does not perform as prescribed, continuity of circuit from tank sending unit to panel unit should be tested with special attention to printed circuit board before replacing gauge. If panel performs properly when tested but fails to operate properly when connected to vehicle system, fuel tank sending unit ground strap should be inspected for proper installation on fuel line. If ground continuity is OK, remove tank unit for testing.
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