C 2500 Suburban 2WD V8-350 5.7L (1994)
Fuel Gauge: Testing and Inspection
Fuel Gauge Inaccurate
1. Ensure terminals are clean and terminal connections are tight.
2. Disconnect fuel tank sender connector, then connect tester J 33431-B, or equivalent, as follows:
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Connect tester red lead to pink wire of the connector, then connect the other lead of the tester to a suitable ground.
3. Set resistance dials of tester to 0 ohms and then to 90 ohms.
4. Gauge should read low when resistance is set to 0 ohms and read full when resistance is set to 90 ohms. Allow some time for gauge to read full
due to the anti-slosh device.
5. If gauge responds accurately, check for clean mounting surface on sending unit to ensure a good ground. If ground is good, replace sending unit.
6. If gauge does not respond accurately, check circuit between gauge and sending unit for an open or short to ground. If circuit is satisfactory, replace
gauge.
