fuel gauge sender, Bench testing Options

[80cap]

Before I install my fuel tank is there a way to bench test the fuel level sending unit?
Thanks Brian

[Dave_Darling]

There should be three (possibly four) electrical contacts in the plug for the sender. One will be a ground, one will be for the gauge, and one will be for the warning light. The ground contact should have a "three parallel lines" ground logo; the wire from the light should be labeled "WK", and the wire from the gauge should be labeled "G".

The ground connection would have a brown wire that plugs into it, the warning light a black wire, and the gauge signal a green wire.

So, with the sender out of the fuel tank and held upright:
- Resistance between WK and ground should be about zero
- Resistance between G and ground should be about 70-100 ohms

With the sender turned upside down:
- Resistance between WK and ground should be infinite (no connection)
- Resistance between G and ground should be ~1-10 ohms

The float inside the sender should slide up and down relatively freely when the sender is turned upside down and rightside up.

--DD