How does setting the float height too low (which means the fuel level in the bowl is too high) affect carburetor operation?

1. It causes the engine to stall only when the throttle is fully opened
2. It prevents fuel from entering the float bowl at all
3. It makes the fuel-air mixture richer across all circuits because fuel has a shorter distance to travel up the jets
4. It makes the mixture leaner because the needle valve closes earlier