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LP fuel is stored in the fuel tank in liquid form with some vapor at the top of the tank at relatively high pressure. The pressure in the tank is determined by the ambient (outdoor) temperature. The higher the temperature the higher the pressure. The heat from the ambient vaporizes fuel until the pressure won't allow any more liquid to vaporize. The tank pressure will be about 200 psi at 110° F, 70 psi at 40° F, and 0 psi at -40° F.
In order for the fuel to be burned at a controlled rate in the generator set (or any other appliance) it must be converted to a vapor form and supplied at a controlled pressure.
LP fuel systems for generator sets are available in 2 forms, vapor withdrawal and liquid withdrawal.