First you got to see if the wiring harness and the guage is good or if it is a issue with the harness, guage, sending unit.
To do this disconnect fuel pump signal line from the sending unit and ground it out, does it show empty? Put on +12v does it show full if not the harness is damaged or the guage is no good.
If it functions properly check the sending unit.
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Saturday, August 2nd, 2008 AT 9:13 PM