- Code P0455-Evaporative Emission Control System Leak Detected (no purge flow or large leak).
- During first few miles of driving, I hear a tick-tick-tick-thump sound coming from the rear of the car that is not related to tires/engine/speed/etc. The thump sound is pretty loud. The tick-tick-tick sounds like some type of piston-actuated pump. After >10 miles or so of driving, these sounds stop.
- After putting gas in tank, car will not start without pumping gas pedal.
- When removing gas cap, there is no ‘rush of air’ sound.
All of this started two weeks ago with no previous issues.
I know that the gas cap is one of the top items for this code but the seal on the cap looks very good. In addition, the local Volkswagen parts department stated that they’ve never ordered one before for replacement. I’ve heard of garages doing ‘smoke tests’ on the evap system-what the heck is that? How easy is it to find all of the little hardware that might be causing these issues?