One problem related to other fuel system tank filling/charging has been reported for the 2004 GMC Envoy. The most recently reported issues are listed below.
P0455 ses light along with fuel tank hard to fill,fuel burping back up filler neck when cap is removed for filling tank,fuel around to of filler tube at gas cap before removal for filling,fuel spell with fuel cap on,first day the p0455 ses light came on replace the fuel cap with factory ac delco replacement cap.