A fuel injector is positioned along {TAIL ~ the side} of the engine and arranged to deliver fuel into {HEAD ~ air} flowing through the passage 
A fuel injector is positioned along { TAIL ~ the side } of the engine and arranged to deliver fuel into { HEAD ~ air } flowing through the passage
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH