I get the "tick, tick, tick" as some have described which may be the purge valve as it seems to decrease at times when car is idling. Someone mentioned theirs was touching the body, or something, and after it was tied back it stopped the ticking. Would like to locate the purge valve on mine if someone can tell me where its located, or possibly post a picture?
FWIW: I hear it inside but when I open the motor lid I can't find were its coming from; doesn't seem as loud as inside the car.