had similar problem also overflow when tank is filled.  vent hoses,gromets
etc wear out (on top of gas tank)  there is a repair kit available.

On Wed, Nov 11, 2009 at 9:46 AM, Rey Wood <boscobelle@live.com> wrote:

> Whenever I leave the van sitting for a few hours, there is a distinct
> gas-like smell on the inside. I have disconnected and blocked the small gas
> pump for the factory installed heater (Westfalia) just to be sure that
> unburned gas was not seeping into that heater compartment.  Have also
> checked the two plastic "Ts" that go into the top of the gas tank for the
> emissions system and both are complete along with all tubes connected to
> them. What should I check next? Anyone ever experienced this before?
>