Excessive Fuel Tank Pressure

By NVDuke
June 30, 2009 in Ask A GM Technician

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NVDuke

Posted June 30, 2009

On my 2003 Tahoe, check engine light came on intermittently and is now on continuously. Trouble code at AutoZone points to Evap system problem. Coincidentally, my fuel tank pressure is so high these days that opening the cap when tank is low literally blows your hair back. Tried new gas cap to no avail. I'm guessing the pressure problem is related to the evap/check engine light on. Any Ideas? Thanks for your help.

Gary

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