It is contemplated that {TAIL ~ fuel return line} 69 may include various components, such as a cooler, a check valve, {HEAD ~ a pressure regulator}, etc 
It is contemplated that { TAIL ~ fuel return line } 69 may include various components , such as a cooler , a check valve , { HEAD ~ a pressure regulator } , etc
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH