Tank collapse can happen due to atmospheric conditions, as well, if the
vent is clogged. Long drive on a hot day, almost empty tank, parked
outdoors on a cold night... gas vapor condenses, greatly reducing its
volume... whooompf!
Ask me how I know... <g>
Chris Attias had this to say:
>As far as I know, a little pressure in the fuel tank is an OK thing.
>Depending on the amount of fuel in the tank and the ambient
>temperature, there will always be some vapor pressure there. You
>would see the most in an almost empty tank on a hot day. My '64 B
>has a brand new vented cap, no vapor canister, and still builds up
>some pressure. The key to tank venting is to not create a vacuum as
>the fuel is pumped out. A powerful enough pump would cause the tank
>to collapse without atmospheric or vapor pressure behind it.
>
>Chris Attias
>'64 MGB
>'84 Alfa Romeo GTV-6
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
|