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I recently bought a second hand 50cc moped, and the fuel gauge always reads empty. I assumed that it was the float sensor that was at fault, so I bought a new one. I connected the new sensor but the gauge still isn't working. Does anyone have any suggestions?

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Step 1: check the gauge works - usually grounding the wire to the tank unit cause a full-scale reading, if good proceed to step 2, if not check wire from gauge, gauge and supply.

Step 2: connect tank sensor to wire from gauge and earth/ground the sensor - move the float and observe gauge, if not working then likely a faulty sensor.

Step 3: fit sensor into tank and check tank is earthed/grounded correctly - use an extra wire to go between tank and ground, if it works - correct the tank earth.

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