The sender on my 405 had holes in it from corrosion and the float had disappeared from the corroded, broken arm. I got a replacement pattern part from Graeme at Bristol Car Parts.
The fuel gauge still didn’t work - sat at empty, so I next cleaned up the electrical connections at the rear of the gauge itself and made sure there was a good earth.
Still no movement.
Finally I took the bezel, glass and faceplate off the gauge and found the pointer was stuck in its bearing. I gently freed it up until the little counter weight on it could easily return it to rest position every time. Now it works, at last !
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