According to yet {HEAD ~ a further aspect} of {TAIL ~ the invention}, there is provided a source of fugitive gases to supply an engine with a supplemental fuel supply, an air intake duct to supply air to said engine and a venturi within said air intake duct to provide a negative pressure downstream of said venturi within said air intake duct, said negative pressure within said air intake duct being operable to draw said fugitive gases from said fugitive gas source into said air intake duct and to said engine 
of
According to yet { HEAD ~ a further aspect } of { TAIL ~ the invention } , there is provided a source of fugitive gases to supply an engine with a supplemental fuel supply , an air intake duct to supply air to said engine and a venturi within said air intake duct to provide a negative pressure downstream of said venturi within said air intake duct , said negative pressure within said air intake duct being operable to draw said fugitive gases from said fugitive gas source into said air intake duct and to said engine
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