Sounds like the purge valve on the engine end of the system is stuck open. In effect you fill the car, the charcoal canister collects the fumes, but with the purge solenoid open the fumes go into the intake and "flood" the engine. Common problem on many makes. It looks like the picture and is mounted next to the EVAP vapor canister.
Image (Click to make bigger)
SPONSORED LINKS
Thursday, December 12th, 2019 AT 3:53 PM