2005 GMC Envoy XL gas gauge reads empty after filling, then slowly moves up after driving but will continue to lose pressure until it reads empty and the light is on, then the check engine light came on.
Common problem on the 03-06 Envoy instrument clusters for the fuel gauge to go out. It's usually caused by one of two main problems, either the stepper motor on the cluster's circuit board is going out or the sending unit on the fuel pump is going out. Check out this blog post about the problem - Envoy fuel gauge problems
The sending unit in your tank is going bad replace it.
Take it to gmc dealer they replace sensor for half price, ablout $220 my end
SOURCE: 2006 GMC Envoy XL gas gauge reads empty
Same problem here with 2006 Envoy. NHTSA has opened an investigation early this year. Be sure to file a complaint with them:
http://www.safercar.gov/
or 1-888-327-4236
Investigation # DP10001: THE PETITIONER ALLEGES THAT THE FUEL TANK LEVEL SENSOR IS DEFECTIVE AND COULD RESULT IN A SUBJECT VEHICLE RUNNING OUT OF FUEL, STALL, AND BEING REAR ENDED BY ANOTHER VEHICLE. ODI WILL EVALUATE THE PETITION FOR A GRANT OR DENY DECISION.
SOURCE: 2006 GMC Envoy XL gas gauge reads empty
The sulfur content in the fuel is contaminating the contacts of the sending unit.
Some people have had good luck with some fuel system cleaners solving this problem. The cheap stuff doesn't seem to do the job.
Not that GM isn't completely exonerated from fault but the gas stations don't do a very good job of watching what the stations sell.
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