36 problems related to other fuel system tank assembly have been reported for the 2004 GMC Envoy. The most recently reported issues are listed below.
Took vehicle in for inspection and check engine soon light was on. A code p0455 was found which means a large gas leak. It was discovered that the gas leak from the gas tank seal where the filler neck hose attaches. Repair is replace fuel tank as the filler neck is built into the gas tank.