Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi there, I am cam. Can I get your first name?How long has this been happening?
Sorry Leroy, the reply was delayed. This suggests there is an EVAP system leak, this is the system that captures the fumes from the tank. Usually we find the charcoal canister leaking or the vent valve in the back above the rear axle is leaking. I suspect that we need to replace the valve and clean out the canister with compressed air.