The reason it will callapse is the vacuum is pulling on the entire surface with
the weakest portion going first.
Wayne Osborne wrote:
> The tanks on a TF has a smaller tube that runs along with the filler tube,
> this tube is the vent and a vented cap is not need. As stout as these tanks
> are, I can stand on my removed one and can't cave it in, its hard to beleive
> that the fuel pumps can create enought suction to collapse it.. Not saying
> it cant happen, maybe on the flimsy gas tanks of new vehicle but hard to
> imagine in on one of these babies....wayne
> At 08:07 PM 2/24/00 -0500, you wrote:
> >
> >I asked this question a couple days ago during the discussion on vapor
> >lock.....no answers so far. It was said that a non-vented gas cap could
> >cause a vacuum capable of crushing the gas tank. My original cap is
> >non-vented........should this be replaced with a vented style? ( I
> >haven't experienced any problems driving my truck as a daily driver.)
> >What year did Chevy go to the vented fuel system......and why?
> >Thanks again, Allen
> >
> >oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> >
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