Alright.. so in the last couple weeks this has been occuring. So if I stand behind my car at idle, you will her "Pshhhhh" literally sounds like air is just leaking out of a small hole of something of that such, right around the gas cap area.. almost exhaust/underneath area.

So.. I didn't think much of it.. was like, we'll its not affecting anything. Actually thought I possibly had a minor hole in my exhaust a couple weeks ago but that definitely isn't it. Ok so when I go to fill up my gas tank, especially if I haven't for a while and I tank the cap off "Psshhhhhhhhhhhshhhhhhh" and you can literally see the gas vapors coming out, it stinks to. Now first time this happened I waited 3-5 minutes till it stopps, filled it up.. worked fine, full tank. Went on driving, still hissed at idle.

Now next time I went to fill it up, took off the cap.. same thing "pshhh" so I just try to fill it up.. This is where I realize it is a real problem, try to put gas in and put about 3 dollars on the ground, 1 gallon of gas all shoots back out. So I am curious to whats causing this.

I was thinking its possibly.. my gas cap? has a crack in it? isn't working properly? anybody! help is very appreciated.

 

Take your gas cap to any shop that performes emmisions tests and they can pressure check it for you. The pshhhh noise is normal, especially since your in a hot weather climate, the tank is under pressure.

 

Alright, thanks for the update.