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The supply of propane to the engine is controlled by a regulator or vapourizer which converts the liquid propane to a gaseous form. The gas is then fed to an air, fuel mixer located close to the intake manifold where it is metered and mixed with filtered air before being drawn into the combustion chambers. As the fuel, air mixture is completely gaseous, the cold start problems associated with liquid fuel are eliminated.

On a per unit of weight basis, liquid propane contains about five percent more energy than gasoline; however, the density is 30% less. The net result is that a litre of propane (lighter) contains about 28% less energy than a litre of gasoline. Propane has an octane rating of 110 and all propane sold in Canada is classified HD 5, (less than 5% other gases, such as butane & methane).

With propane, a greater quantity is required to travel the same distance. But because of its gaseous form, your engine runs more efficiently which helps offset the extra propane consumed. The fact that propane is introduced to the combustion chamber as a vapour, a vehicle may actually run better on propane than on gasoline in low-speed, light-throttle conditions, especially when cold.

The greatest environmental benefit comes from reduced evaporative losses, including those which occur during refueling. This is because the propane fuel system is effectively sealed. As well, the inherent tendency to form ground-level ozone is half that of gasoline and propane does not contain lead or sulfur which contribute to acid rain.

Engines using propane can last two to three times longer than a gasoline engine.