The fuel pump can continue to deliver up to one-stroke's worth of gasoline after the engine is off. The cam cocks the pump and the spring delivers, so if the engine stops with the cam out of the way of the pump lever, one full pump's worth of fuel can be delivered. Now that wouldn't be enough to flood the engine compartment, but it could make a small puddle.

Donald.

Nolan Penney wrote:

My immediate thought is that something is missing from this story.  When
the engine is shut off, the fuel pump is shut off (if mechanical), so
there is no supply of gasoline to overwhelm the float and continue
filling the bowl to enable overflowing.  So it seem something is missing
from the story here.  Do you have an electric fuel pump that is failing
to shut off?  Do you have a heat percolation problem from the exhaust
manifold?

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