Fillpipe Restrictor: Description and Operation

PURPOSE
The restricted opening of the fuel tank filler pipe allows only a non-leaded fuel nozzle to be inserted.

OPERATION
The smaller non-leaded fuel nozzle will fit through the narrow opening and push the trap door aside, allowing normal filling with unleaded fuel. Leaded fuel nozzles will not fit through the narrow opening. The trap door being closed causes a fuel backup and automatic nozzle shut-off.

CONSTRUCTION
The restrictor consists of a narrow opening in the fuel tank filler pipe covered by a spring steel trap door. The restricted fuel filler is manufactured as an assembly and must be serviced by removal and replacement with a new fuel tank filler pipe.