fuel gauge inaccurate

2005 BUICK TERRAZA
176,501 MILES
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VETT 2010
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  • 2 POSTS
Fuel gauge not actually.
Oct 9, 2016 at 6:27 PM
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AL514
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what is wrong with your fuel gauge? not working?
Oct 9, 2016 at 8:24 PM
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VETT 2010
  • MEMBER
  • 2 POSTS
when fuel is empty gauge still shows there is fuel in the tank.
Oct 10, 2016 at 3:28 AM
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AL514
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 5,479 POSTS
the diagnostic start on this would be to check for DTCodes, there is a code for the sending unit, is the check engine light on? The gauge is controlled by the float in the gas tank. I would start at the tank with the float/sending unit. With a multi-meter check the resistance of the unit while moving the float up and down. Considering all the information for the dash gauges is send on a data wire from the ECM and its only the fuel gauge acting up. Start at the tank, make sure the ground wire has low resistance also. Here is a wiring diagram to help (wires are highlighted in yellow). I have seen many sending units in the tank go bad. Hope this helps.
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Oct 10, 2016 at 4:08 AM