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Fuel gauge inaccurate

Tiny
VETT 2010
  • MEMBER
  • 2005 BUICK TERRAZA
  • 176,501 MILES
Fuel gauge not actually.
Sunday, October 9th, 2016 AT 6:27 PM

3 Replies

Tiny
AL514
  • MECHANIC
  • 4,110 POSTS
What is wrong with your fuel gauge? Not working?
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Sunday, October 9th, 2016 AT 8:24 PM
Tiny
VETT 2010
  • MEMBER
  • 2 POSTS
When fuel is empty gauge still shows there is fuel in the tank.
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Monday, October 10th, 2016 AT 3:28 AM
Tiny
AL514
  • MECHANIC
  • 4,110 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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Monday, October 10th, 2016 AT 4:08 AM

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