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Vehicles fueled by liquefied petroleum gas (LPG) are also required to provide high levels of engine torque and power, in addition to clean emissions for environmental friendliness, low fuel consumption and energy savings. In response to these demands, it can be expected that engine control performance and exhaust emissions can be substantially improved by controlling the fuel supply system with high accuracy. Energy savings along with higher levels of speed, accuracy and reliability can also be expected. The conventional method of controlling fuel supply systems has been to control the fuel injection pressure to a high level at all times under all engine operating conditions, regardless of the amount of fuel injected.