Not an unusual problem in these days of people swapping parts from cars not of
the same vintage. I had the same problem that was caused by my using a
Spit 1500 tank in my Mk1 with a non-vented cap. I had plugged the vent port
because I did not have a carbon canister. The tank would create a vacuum
as the fuel was used especially when the tank was full. I ended up running a
vent line out the right hand fender well. All is now right with the
world!
Joe
P.S. I have also heard of tanks imploding when the vacuum gets high enough!
Don Spence wrote:
>
> I had a similar thing happen once with my 72 TR6. I'd be happily driving
> along a few blocks from home and the engine would start wheezing. I opened
> the filler cap to visually check for gas and it hissed as the outside air
> rushed in. Car started right up again. Before I got around to fixing it I
> had the "pleasure" of reaching back to pop the lid a couple of times as the
> carbs reached the starvation point. Instant relief.
>
> 4. The carbs are getting starved for fuel because your fuel tank is
> developing a vacuum as the fuel pump draws fuel out. Perhaps your gas cap's
> vent is plugged. Or perhaps you mis-rigged a vacuum line that is supposed
> scavange vapors from the tank, so you are "vacuumizing" your tank too much.
> If you loosen your gas cap does the problem still happen?
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