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