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The fuel gauge is a very simple affair. The gauge itself, a 3 terminal voltage regulator and the in tank level sensor. Check fuses first, check for a good ground to the fuel gauge sensor on the tank. Pull the wire on the tank sensor, ground the wire, with key on gauge should deflect. No gauge movement means bad gauge or regulator. Reconnect wire. Check for 12V at the input of the voltage regulator, check for around 5V at the gauge side of the VR. If no suspect bad VR. If yes suspect bad gauge. If gauge does deflect when grounding tank sensor wire the intank sensor is bad and must be replaced.

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Q: How do fix fuel gauge on 1974 Volkswagen super beetles?
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