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I <br /> FUELS <br /> The fuel to operate the engine is propane . Propane <br /> I has no listed sulfur content or H2S content . The <br /> amount of excess combustion air utilized is estimated <br /> at 30 percent and the cubic feet per hour is <br />' estimated at 3200 cubic feet of air per hour . <br /> Propane has a BTU rating of 91,610 BTU' s per gallon <br /> The system will use approximately 0 . 79 gallons of <br />' propane per hour , or 19 gallons per day . <br /> 1 Safety <br /> The Engine is powered by propane augmented by the soil vapors that <br /> are extracted the engine will automatically shut down'if it gets low on <br /> crankcase oil A factory installed oil sensing device accomplishes this. <br /> The ro engines ane regulator is a two stage regulator The first stage <br /> g propane <br /> provides an initial propane injection large enough to start the engine <br /> The secondary regulator is a vacuum operated regulator that operates <br /> on engine vacuum taken from the intake manifold This secondary <br /> regulator is the one that allows the engine to operate on a continuing <br /> basis <br /> If the engine shuts down for aany reason it loses the manifold vacuum <br /> and automatically closes the regulator which shuts down the propane <br />' fuel source <br /> I <br />