Auto Repair Manual Free Download and ReviewsFree download ebook pdf files automotive manual

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FUEL SYSTEM DESCRIPTION Fuel is drawn by the supply pump through a pre-filter screen in the tank and to the engine through the fuel supply lines. There is no lift pump in the fuel tanks or on the frame. The fuel passes through the base plate of the fuel injector control module (FICM) to cool the module. From the FICM the fuel flows to the fuel filter/heater element housing, which combines a water separator, a prime pump, a fuel heater element and a filter element. The fuel is then delivered to the high-pressure pump. An integrated hand pump is used to prime the fuel system after changing the fuel filter or servicing the fuel system. The fuel injection pump at the front of the engine valley includes the fuel supply pump and the high-pressure pump. If the fuel system is not suppling enough fuel, a driveability concern may occur. If air is being drawn into the fuel injection system, a Cranks But Will Not Run or Hart Start symptom could exist. HIGH PRESSURE SYSTEM The much larger section of the pump assembly is the high-pressure fuel injection pump. The pump is engine-driven by the camshaft gear. From the high-pressure pump, the pressurized flows to the left common fuel rail. A balance pipe from the center of the left rail then feeds the right common fuel rail. Each common fuel rail supplies one bank of 4 fuel injectors. The fuel rail pressure sensor is mounted in the middle of the right common fuel rail. RETURN SYSTEM The fuel return system routes fuel from the fuel injectors and the fuel injection pump. The fuel rail pressure relief valve is located in the rear of the left common rail. The return fuel travels to the fuel cooler and then to the fuel tank. This fuel is used to cool and lubricate the injection pump and the injectors. DIAGNOSTIC AIDS The following conditions may cause an air leak into the fuel supply system: Deformed or cut O-rings at the fuel supply line connections Improperly seated fuel supply line fittings Porous or weathered rubber fuel supply lines

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1. Remove the intake manifold. 2. Remove the turbocharger heat shield. 3. Remove the bolts and the high-pressure oil pump cover. Use a thin gasket scraper to separate the cover from the crankcase. Remove and discard the press-in-place gasket. 4. Remove the bolts from the high pressure oil pump discharge pipe. Using the special tool, disconnect and remove the high-pressure oil pump discharge pipe. Remove and discard the D-ring seal. 6. Remove and discard the high-pressure pump O-ring seal. 7. Remove the bolts and the high-pressure oil pump. 8. Remove and discard the lower O-ring seal. INSTALLATION 1. Install a new lower O-ring seal. 2. Install the high-pressure oil pump and bolts. Install the high-pressure pump O-ring seal. Install the oil pump discharge pipe. 5. Install the bolts for the oil discharge pipe. 6. Position the dial indicator with bracketry onto the oil pump drive and check the oil pump drive gear backlash. 7. Install a new D-ring seal on the high-pressure discharge pipe.

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Rotate crankshaft in direction of rotation to 14o + 0.5o (arrow) after ignition TDC of cylinder 1 Unscrew central securing bolt (40/3) Remove chain tensioner Unplug socket of injection pump (Y23/1) at plug connection Unbolt engine wiring harness (1) at oil filter housing Unplug connector at electronic IFI shutoff (Y1/1) Detach fuel lines (arrows) at the injection pump Unscrew bolt (10/3) Unscrew bolts (10/1) Slacken bolt (30/1) of start of delivery setting device Remove injection pump (10) Replace O-rings (10/4) Install in the reverse order Inspect start of delivery Set start of delivery Injection pump, unit pump, high pressure pump Designation Central bolt for attaching injection pump Bolt of injection pump bracket at rear to engine block Bolt of injection pump front M8 Screw plug to governor housing