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Model 425
Model E
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Propane is stored in the fuel tank as a pressurized liquid but is metered into the engine as a gas.  This is also known as fumigation.  The propane converter accomplished this task by evaporating the fuel with heat supplied by the integral heat exchanger and then regulating the pressure in a two-step pressure regulator to a pressure just below atmospheric.  The device that evaporates the fuel and regulates its pressure is known as a converter.

Propane is metered into the engine with a propane mixer.  The mixer supplies a fixed ratio of fuel to air and the ratio is controlled by the shape of the air valve.

 

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