If you are still getting the check gas cap message, it is still seeing a failure. The problem with testing for evap leaks, is several specific criteria have to be met for the vehicle to run it's test. I would guess that when you see the check gas cap message, it run and failed. It still could be a leaking gas cap, faulty tank pressure sensor, or system leak.
Wednesday, March 10th, 2010 AT 3:58 PM