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A restricted fuel system such as a plugged or restricted fuel filter and cause a vehicle to lose horsepower.Modern cars with fuel injection make the job of changing your own fuel filter more involved since the lines are pressurized even when the engine is turned off.With high gas prices these days, avoiding a trip to the station feels right. However keeping your tank full most of the time will save you money.  Free space in the tank contains water vapor which condenses on the sides. Besides mixing with the gas, it causes rust to form which settles in the bottom of the gas tank.