Excessive Fuel Tank Pressure

[cruiser100]

I've noticed a strong odor of gas fumes in my garage over the past few days. Upon inspection I noticed a sound (not hissing but similar) coming out of the fuel cap area. There was a visible vapor plume coming from the area as well. I carefully backed off the fuel cap and there was a significant pressure release, much more than normal. I tightened the cap back down and within seconds the sound and fumes came back. I decided to let it sit for about an hour as is. When I returned the sound a fumes were gone.

The same thing has happened for the past three days after an hour plus drive home from work. I'm not sure if it's happening once I park when I get to work, but my guess is that it does. however, on short trips, less than 10 minutes, I haven't seen the problem - yet. The vehicle drives fine and I have no CEL at this point. Haven't checked for codes yet. Temps have been in the 80's if that makes any difference.

Any ideas of where to start looking for the issue? EVAP canister, fuel cap, etc?

Thanks.

 

[RobRed]

vapor recovery canister clogged.

significant info available on a search.

 

[cruiser100]

Did that. Came up with a lot of information that may or may not be relevant.

A link would be awesome

 

[jLB]

There's a post in this thread, that links to a number of related threads:

Real time help sputtering with fuel smell in cabin

 

[spressomon]

Although probably rare to have a faulty fuel cap its relatively, in the scheme of things, cheap to replace with new. Generally the EVAP issues seem to come up when ambient temps are higher than 80's and/or when climbing steep sustained grades. When conditions are just right (i.e. hot ambient temps and climbing) I'll get increased tank pressure and the acrid smell. But I'm running 2-fuel tanks into one EVAP can so it exacerbates the issue ...

Wish we had a cheap charcoal canister fix like the 80-Series guys do!

 

[hoser]

Vapor canister is located above your spare tire. Replacing it would likely fix your problem. But you can sometimes have success with cleaning/blowing them out.

 

[cruiser100]

Yeah, I read 14 pages of the 80 series issue, saw someone using a taco evap can.

I'll give the gas cap a go first. It's been in the 80s here in ATL but nothing like the 95+ we were dealing with a couple of weeks ago.

If that doesn't work I'll pull the evap and try to blow it out.

Thanks for the feedback and thanks for the link jLB.

 

[abuck99]

Cruiser100,

Realize you're in a different rig now, but did you ever get to the bottom of the vapor/pressure issue?

I'm experiencing the same prob, returning from longer drives in 85+degree weather. I installed a new fuel cap 6 months ago as a PM- but this is the first time I've experienced this. I can hear the vapor pressure coming out of the relief valve in the cap, and the fuel vapor is substantial.