Tamper proof idle adjusting screws

Claim 1

A fuel metering system effective for metering the rate of fuel flow to an associated combustion engine, comprising body means, conduit means formed in said body means communicating with a source of fuel, orifice means formed generally in said body means for receiving fuel from said conduit means and discharging said fuel into induction passage means associated with said engine, an opening formed in said body means, said opening receiving adjustably positionable valve means, said valving means being selectively adjustably positionable with respect to said orifice means in order to thereby cooperate with said orifice means in order to cooperatingly define an effective metering area for metering said rate of said fuel flow from said conduit means and to said induction passage means, and separate closure means formed from a resilient, non-fragile material and press fitted into said opening after low torque adjustment of said valving means as to effectively close said opening to access to said valving means, said closure means comprising generally tubular body means received generally between said valving means and said opening, and an end wall portion carried by said tubular body means and covering an end of said valving means, said closure means being positioned upon application thereof so as to be recessed within said opening to conceal the presence of said valving means and simulate an ordinary body plug and to not be easily removable with hand tools, said end wall forming the bottom of said opening, said opening formed in said body means comprising an opening inner surface, said closure means comprising outer closure surfaces means and inner closure surface means, at least a major portion of said outer closure surface means engaging said opening inner surface, and said inner closure surface means engaging said adjustably positionable valving means, said tubular body means also providing a continuous press-fit air-tight seal to prevent vacuum leaks from said induction passage past said valve means to said opening, said press fit also providing axial retention of said valving means so as to maintain initial adjustment thereof.