An apparatus 4, {HEAD ~ the fuel tube} having a fixed location so as to vary in proximity to the shock wave upon changes in {TAIL ~ nozzle flow area} and manifold vacuum 
An apparatus 4 , { HEAD ~ the fuel tube } having a fixed location so as to vary in proximity to the shock wave upon changes in { TAIL ~ nozzle flow area } and manifold vacuum
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH