Diesel fuel nozzle restrictor

A diesel nozzle restrictor for preventing the filling of a diesel fuel tank with an unleaded fuel nozzle comprising:

• an attachment flange having a top which is structured to receive a fuel cap, a bottom of said attachment flange which is structured to receive an end of a diesel fuel filler neck;
• a nozzle tube extending from a bottom of said attachment flange, a nozzle bore being formed through said nozzle tube;
• a closure cap being pivotally attached to a bottom of said nozzle tube;
• at least two release arms being attached to a top of said nozzle tube, a projection extending from each said release arm, said projection extending through a wall of said nozzle tube into said nozzle bore, a ledge being formed at an end of said release arm, said ledge preventing said closure cap from pivoting open, wherein insertion of a diesel fuel nozzle pushing said projection back and removing said ledge from under said pivot door and allowing the diesel fuel nozzle to push open said closure cap, an unleaded fuel nozzle not being capable of opening said closure cap.

A diesel nozzle restrictor for preventing the filling of a diesel fuel tank with an unleaded fuel nozzle comprising:

• an attachment flange being attached to a diesel fuel filler neck;
• a nozzle tube extending from a bottom of said attachment flange, a nozzle bore being formed through said nozzle tube;
• a closure cap being pivotally attached to a bottom of said nozzle tube;
• at least two release arms being attached to a top of said nozzle tube, a projection extending from each said release arm, said projection extending through a wall of said nozzle tube into said nozzle bore, a ledge being formed at an end of said release arm, said ledge preventing said closure cap from pivoting open, wherein insertion of a diesel fuel nozzle pushing said projection back and removing said ledge from under said closure cap and allowing the diesel fuel nozzle to push open said closure cap.

A method of preventing a diesel fuel tank from being filed with unleaded fuel, comprising the steps of:

• (a) attaching a nozzle tube to an inside of a diesel fuel filler neck;
• (b) providing a releasable door at a bottom of said nozzle tube;
• (c) providing at least one release arm, an end of said at least one release arm preventing said releasable door from opening;
• (d) providing at least two actuation projections which protrude through said nozzle tube, said actuation projections being loaded such that they resist outward movement, outward movement of said at least two actuation projections forcing an end of said release outward;
• and
• (e) inserting a diesel nozzle into said nozzle tube, said diesel nozzle forcing said at least two actuation projections outward, said releasable door opening after said at least one release arm ceases supporting said releasable door.