Water In Fuel sensor Some vehicles are equipped with a water in fuel sensor that will alert the driver to the fact that water is present in the fuel [1]. The water may then be drawn off through a valve in the bottom of a water separator. Water is extremely damaging to the injection system Fuel filter Diesel fuel must be kept clean to avoid injector system trouble. Very small particles are enough to clog injector nozzles or jam the injector. Diesel fuel systems typically use one or more filters to trap dirt and other deposits Diesel Injection Pump Diesel fuel is injected directly into the cylinder at the top of the compression stroke. Due to the high compression(around 22: 1)used in diesel engines, the diesel injection pump must be capable of producing high pressures. Injector pump pressures vary greatly depending on the pump and engine. Pressures can range from 3000-15,000 psi(20 685-103 425 kPa)Water In Fuel Sensor Some vehicles are equipped with a water in fuel sensor that will alert the driver to the fact that water is present in the fuel [1]. The water may then be drawn off through a valve in the bottom of a water separator. Water is extremely damaging to the injection system. Fuel Filter Diesel fuel must be kept clean to avoid injector system trouble. Very small particles are enough to clog injector nozzles or jam the injector. Diesel fuel systems typically use one or more filters to trap dirt and other deposits. Diesel Injection Pump Diesel fuel is injected directly into the cylinder at the top of the compression stroke. Due to the high compression (around 22:1) used in diesel engines, the diesel injection pump must be capable of producing high pressures. Injector pump pressures vary greatly depending on the pump and engine. Pressures can range from 3000-15,000 psi (20 685-103 425 kPa)