Would bet Jerry is correct about the vaporized fuel.

Fuel expansion/leak

The fuel filter acts as an "expansion tank" to relieve some of the pressure. Fuel is forced by the fuel valve in the carburetor.

Jon.


Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop