A fuel filter has four of the cores arranged symmetrically about {HEAD ~ a longitudinal center line} of a housing to form {TAIL ~ a longitudinal flow passage} 
A fuel filter has four of the cores arranged symmetrically about { HEAD ~ a longitudinal center line } of a housing to form { TAIL ~ a longitudinal flow passage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL