Fuel warning light is throughout
If the light stays on permanently you probably have a short on the wire from the tank sender to the dash. This happens when the wire is pinched to an earth somewhere along the line.
Disconnect the wire from the tank sender unit and check again. If it is still on, chances are the wire is shorting along the line..
Its 1 of 2 things.
1: the fuel is low, use a dip stick, if gauge reads ok.
2; or the tank sender is bad, but gauge reads wrong.
3: the guage wire is disconnected, cut or corroded connections.
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