When i open the gas cap there is a hissing sound. Is this normal, it seems like there shouldn't be if the pressure valve in the gas cap is working properly.
Gas Cap Hissing
- Thread starter hadji_85
- Start date
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this is normal on most cars
The question then is does your cap suck or blow? Apparently blowing is normal. Sucking may lead to a gas leak. I'm pretty sure the one on my truck sucks, so I need to figure out if/where there is a clog in the evap. system? I haven't quite figured out what I'm looking for there exactly.
Parts of that just sound so wrong.
Parts of that just sound so wrong.
you are talking about when the cap is screwed on right? if i read correctly he is talking about when you unscrew the cap to fill up.
- Thread starter
- #7
lol
how am i going to figure out if it...is creating a vaccuum or positive pressure?
how am i going to figure out if it...is creating a vaccuum or positive pressure?
It is quite easy to tell when you remove the fuel cap. A rush of air coming out of the filler means the tank is pressurized (normal.)
-B-