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Petrol gauge not working?

my petrol gauge doesnt work in my volvo 740.it floats empty to full reading regardless whats in the tank,i have changed the instrument panel with no success.
Ian30872, January 2012
is the wiire trapped ,worn ,making it earth out. if you disconect the tank unit it usually reads empty or the tank unit may be at fault

bob, January 2012
sender unit in tank or voltage regulater in dash faulty

mm, January 2012
link Click here to see other fixes for Volvo.