Why Does Fuel Leak Into the Carburetor Bore
Gas is probably being siphoned out of the float bowl.
- Carburetor vent plugged. The float bowl needs some kind of vent.
- Gas cap not vented. After driving remove the cap and see if you get a vacuum suck.
- Carburetor check intake not working.
- Carburetor accelerator pump discharge isn’t restricting fuel when not accelerating.