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2005 Chevy Trailblazer Gas Gauge Problem

Tiny
DSHULL
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 68,000 MILES
When I fill up, the gauge will rise while filling (key turnd on to assc) and as soon as the tank fills, the gauge falls to below empty. After 24-48 hours, the gauge will then register that there is gas in the tank, and it is close to the correct amount (may be correct, no way of really telling). If I do a partial fill up, the gauge works properly. I'm thinking I've got an electrical problem and not a float problem, but I have no way of really knowing. Can you please help?
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Friday, February 12th, 2010 AT 10:45 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You need to see if you are getting power to the sending unit first. If it is then it may be a guage problem. A test light would work on this, just find the right wire. One will be ground, one for pump and another for the guage. The guage will eitehr be low voltage or blinking light.
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Wednesday, February 17th, 2010 AT 12:21 PM

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