{TAIL ~ A source} of fugitive gases is directed to the air intake of {HEAD ~ the engine} 
{ TAIL ~ A source } of fugitive gases is directed to the air intake of { HEAD ~ the engine }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD