2005 Chevy Trailblazer gas gauge

39,000 MILES • 6 CYL • 4WD • AUTOMATIC
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KEYON520
  • MEMBER
  • 1 POST
the gas gauge want work even when it full of gas
Jan 13, 2009 at 8:27 PM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
It is either the sending unit in the tank or the gauge in the IP.

To check the sending unit you have to remove the tank and fuel pump module, connect an ohmeter to terminals 1 and 4 of the connector. Move float to full position and slowly move to empty position, if resistance goes down smoothly then sender is OK and problem is with gauge or wiring, if not then replace sender.
Jan 14, 2009 at 12:02 AM
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