As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS NOTICED FUEL POURING FROM THE ENGINE COWLING OF THE AIRCRAFT; IT ONLY STOPPED AFTER THE FUEL SELECTOR WAS TURNED TO OFF. INSPECTION REVEALED THE CARBURETOR FLOAT WAS STUCK DOWN OR HAD SUNKEN, CAUSING FUEL TO OVERFLOW FROM THE CARB BOWL. HAD THIS CONDITION PRESENTED IN FLIGHT, IT WOULD HAVE LIKELY CAUSED A LOSS OF ENGINE POWER DUE. THIS CARB WAS INSTALLED ONLY 6 DAYS PRIOR.