As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) MODIFICATION OF CARBURETOR SINGLE PIECE VENTURI AND METAL FLOAT INSTALLATION WAS DONE IMPROPERLY. THE SPRING WHICH BRINGS DOWN THE NEEDLE WHEN THE FLOAT DROPS AS THE FUEL LEVEL LOWERS WAS INSTALLED TO THE FRONT INSTEAD OF FROM THE LEFT OR RIGHT SIDE. IN THIS CONFIGURATION THE FLOAT IS JAMMED IN THE UP POSITION AND FUEL IS PREVENTED FROM ENTERING THE CARBURETOR.