Fillpipe Restrictor: Description and Operation

PURPOSE
All vehicles are equipped with a restricted fuel tank filler pipe opening that allows only a non-leaded fuel nozzle to be inserted.

OPERATION
The restrictor consists of a narrow opening in the fuel tank filler pipe covered by a spring steel trap door.

The smaller non-leaded fuel nozzle will fit through the narrow opening and push the trap door aside, allowing normal filling. Leaded fuel nozzles will not fit through the narrow opening. The vent pipe causes a fuel backup and automatic nozzle shut-off when fuel reaches a designed-in level in the fuel tank.

The restricted fuel filler is manufactured as an assembly and must be serviced by removal and replacement with a new fuel tank filler pipe.