Here you go. Hope this helps a little bit better to the discussion.
http://findarticles.com/p/articles/m.../ai_n21100412/
"I have emphasized in previous articles that a typical purge solenoid valve is normally off (electrically) and normally closed (mechanically). The valve should be pulsed open and closed only during an evap purge cycle. It's also pulsed during an evap monitor on systems that are tested with engine vacuum. If the purge solenoid valve leaks for any reason, the engine gets an enormous, unwanted sncxitful of fuel vapor. Although this extreme rich condition is temporary, experience shows it actually may prevent the engine from starting! For example, this has occurred on some Hyundai Sonatas equipped with leaking purge solenoid valves. Like the Audi A6 I just mentioned, these Sonatas with the leaking purge valves could also suffer from hard starting (long crank times)"