Operation

OPERATION

WARNING: High pressure fuel lines deliver diesel fuel under extreme pressure from the injection pump to the fuel injectors. This may be as high as 1600 bar (23,200 psi). Use extreme caution when inspecting for high pressure fuel leaks. Fuel under this amount of pressure can penetrate skin causing personal injury or death. Inspect for high pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate protective clothing when servicing fuel system.





The high pressure pump (1) is driven by the camshaft and requires no timing. Fuel that enters the high pressure pump (1) is pressurized between 200-1600 bar (2,900 - 23,205 psi). The pressurized fuel is then supplied to the fuel rail. The high pressure pump (1) and flange located behind the pump are supplied as an assembly. Fuel passages and control elements in the flange regulate the flow of fuel to the high pressure pumping chambers, and control the lubrication of the pump.

NOTE: The high pressure pump must not be disassembled or opened. The only serviceable items are the temperature sensor and the fuel quantity solenoid.

CAUTION: Cranking the engine for an extended time without a fuel supply may damage the high pressure pump.