Heavy gas smell

Frnknsteen said

If that is the case, I suppose turning the car could get the fuel to slosh up the filler tube, and with nowhere to go, it would flow through the vent tube and dump below, causing the heavy smell and occasional spill that I have seen.

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I wouldn't go that far. I'm not saying it can't happen, but i've never seen it. If you somehow, someway, had a very full tank, and 'sloshed' the gas all the way up the filler neck, it should just drain back down. The vent line is on top of the filler neck to avoid any gas that might somehow get up there from getting into the vent line.

Moving forward, you should definitely check to make sure that vent line is hooked up correctly (venting beneath the car) and clear of any debris.

From what you've described in this thread it sounds way worse than a vent line misshap though, such as when you described gas pouring out of the passenger side and down the fender. I'm sure you'll figure it out when it's on the lift and the tank is dropped. Good luck.