These collected fugitive gases are fed into ducting 131 extending to {HEAD ~ a diverter valve} 112 which, in a first configuration, passes the fugitive emissions to the normal vent or stack 113 to bypass the engine 101 and which, in a second configuration, pass {TAIL ~ the gases} to a flow meter 114 and thence to the air intake 120 of the engine 101 
pass
These collected fugitive gases are fed into ducting 131 extending to { HEAD ~ a diverter valve } 112 which , in a first configuration , passes the fugitive emissions to the normal vent or stack 113 to bypass the engine 101 and which , in a second configuration , pass { TAIL ~ the gases } to a flow meter 114 and thence to the air intake 120 of the engine 101
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