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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