Fuel Filler Caps

[steve ravet]

> No actual experience with a gas tank .... but I can assure you that
> 15 - 20 " Hg will collapse a gas tank .... I've done 55 gal drums. 
> Wanna do sumpin' dumb (besides talking to me???).  Take a TV picture
> tube, put it in a 55-gal drum (one that seals with the ring, where
> the whole top comes off) and shoot it with a .30-.30 or such .....
> it'll collapse the drum.  Almost as much fun as the time we rolled
> the old Plymouth off the cliff (hee-hee)

Now, you can't drop a line like that without telling the whole story, 
so give....

--steve