From the latest responses, it sounds like I will just have to start with the overfill line at the fill spout, and work my way forward! Thanks again guys; you gave me some specific things to on which to focus my attention.

I'm sorry, I can't help myself.

If you have a foul gas oder under your rear end, quit going through the drive through at Taco Bell, and lay off the refried beans!  That will help!

Sorry again....  

Hey Ken. I have that refied bean problem. Found out the smell comes from my "emission control". 

I'm also sorry

Many years ago some one actually wanted to affix catalytic converters to the greatest source of methane emissions in the country.   Cows.  They blow it out of both ends.  I wonder how the cows would feel about this?????

Okay it's true, but I should probably stop this before someone tells me to sit on a cannister.