PUMP-HIGH PRESSURE FUEL
DESCRIPTION
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 mounted to the front of the left bank cylinder head.
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.
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.
REMOVAL
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.
1. Remove engine cover.
2. Remove negative battery cable.
3. Release fuel pressure.
4. Remove high pressure line support bracket.
5. Remove high pressure line retaining nut .
6. Remove the return line clamp using Fuel Line Pliers 9539.
7. Remove the inlet supply clamp using Fuel Line Pliers 9539.
8. Remove both rubber lines at the pump.
9. Disconnect the pump electrical connectors.
10. Remove the pump mounting bolts.
11. Remove the pump assembly.
CAUTION: Do not crimp or bend fuel line. Capture all fluids that flow out of connections.
INSTALLATION
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.
1. Install high pressure pump to the left cylinder head. Torque mounting bolts to 14 N·m (10 ft. lbs.).
2. Connect the pump electrical connectors.
3. Install fuel lines at pump.
4. Install inlet supply line clamp using Fuel Line Pliers 9539.
5. Install return line clamp using Fuel Line Pliers 9539.
CAUTION: Do not crimp or bend fuel line. Inspect sealing cone at line; replace line if compression exists.
6. Install high pressure fuel line retaining nuts. Torque nuts to 33 N·m (24 ft.lbs.).
7. Install high pressure line support bracket.
8. Install negative battery cable.
9. Install the engine cover.
10. Start engine and check for leaks.