{HEAD ~ A fuel delivery system} moves {TAIL ~ fuel} through the passageway from the infeed end to the delivery end 
{ HEAD ~ A fuel delivery system } moves { TAIL ~ fuel } through the passageway from the infeed end to the delivery end
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH