Fuel light doesn't work

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New member
I don't know what it is, but my low fuel light doesn't work anymore.

Ive pulled out the dash, and checked that it isn't the light. It still works. I also checked the sender while it was out of the car, but it seems to work fine. What else could it be? Is tehre some sort of black box or wiring i should check as well?

Also, just a general question on the sender, tehre are 2 parts, the floaty bit and a little round bit, whats the round bit do?
 
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