CR-V Bonnie

I drive a 2001 CRV LX for a rural mail route with 50 miles and 760 starts and stops each day as well as additional idle time at each mailbox, totaling 6 - 7 hours of run time per day. I've always been extremely careful to do all maintenance, both scheduled and preventative. Car now has 93K actual miles, not including all the extra idling time and it has no symptoms of malfunctioning other than recently starting to burn oil (no leaks).
However, for the past 6 months I've been noticing extreme raw gasoline fumes to the point of dizziness and nauseau once the car warms up after being on the route for 30 minutes or so. But the kicker is this.... it only happens when the outside air temp rises to about 75 or above. The hotter the air temperature the more extreme the fumes become. If it's cool outside there are no fumes whatsoever. As long as it's warm outside, fumes are there regardless if window is up or down, AC on or off.
I took it to a muffler shop and a thorough examine turned up no exhaust leaks. No check engine codes either. Texas summer is already here. Temps of 93 degrees on Thursday made me realize I have to figure this one out or I'll develop cancer before Summer time is over. I've searched the forums and think maybe something is wrong with the Evaporative Emissions but where to start? Any clues would be greatly appreciated. Thanks.

GoLowDrew

I have no answer. In for additional response.

Last summer my Ody have the exact same issue. But it only happened when the outside temp is like 110 degrees. It was really strong on one day, on this one trip, when the temp was at it's highest.

I'm not been able to duplicate it again, so I just left it.

My search on the internet forums show me cases where the fuel cap area. Something like it's common for Odys to have a crack in the neck area leading up to the tank. However, I swear the gas smell came from the front.

I even tired spot check, by stopping. Opening the hood, and do the nose test. No smell.

Other Ody owners guess it's got something to do with how the car draws air into the cabin. And maybe it's unburnt fuel evaporating before it gets burn, coming out of the OEM intake. Because the Ody's design faces inward, it's easy for the vents intake to suck it into the cabin. If that does not make sense, it's ok. It was just a summary of guesses.

Most cars, the OEM intake opening faces forward. Not backwards like the Ody. I don't understand why Honda designed it that way. I guess space must be tight.

I'm waiting to see if the same thing happen this summer.

I never looked carefully under a CRV.

Let me ask you this. Do you have the OEM intake box and OEM paper filter? I run OEM box with K&N.

CR-V Bonnie

Yes, it is the OEM intake box. And, I recently replaced air filter and cabin filter with highest quality manufacturer recommended equipment, if this is what you mean. Still learning some of the terminology. Sorry. Do appreciate your input. If I can't find an answer, I'll have to use my Honda Odyssey but it's a little bit large for reaching mail out of the window.
Next time I run the route, I think I'll stop and vent the gas cap to see if releasing pressure makes any difference. Just seems that because it takes about 30 minutes of run time before the fumes become blatantly strong, it may coincide with pressure building up somewhere. Of course not being an experienced mechanic, I'm just guessing and trying to think of all possibilities???
Am I correct in assuming that if it were a bad catalytic converter I would be getting a engine code light?