As I was told by both the folks at Fuel Safe, and ATL (both are one company now as I understand it), the issue with fumes isn't the venting (at least not alone), but the bladder. It will allow vapor release, and there ain't squat you can do about it. In fact, the guy I talked to actually talked me into a lesser bladder (I have the cross linked poly unit) from the fabric type I had been eyeing, he said there'd be less vapor release, it'd stand up better to the crap additives that the fuel companies are forced to put into pump gas (remember WAY back when that gas used to smell good?), and for a part time track car I'd be happier.
And yes, the obvious solution is race gas, Matt is so smart. Or something like that. Overall, it's not that bad, so don't stress about it too much.
M
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