A check valve system 2 and further comprising {HEAD ~ an accumulator} operably positioned within {TAIL ~ said second duct} between said second fuel source of said fugitive gases and said engine 
operably positioned within
A check valve system 2 and further comprising { HEAD ~ an accumulator } operably positioned within { TAIL ~ said second duct } between said second fuel source of said fugitive gases and said engine
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH