ENGINE SYSTEMS CONTINUED
Fuel System Continued
4. The fuel injection pump mounts on the left front side of the engine. This pump increases fuel pressure to a
range of 10,152.7 to 18,855 psi (70 to 130 MPa). The pump delivers the fuel to the high-pressure manifold
(rail). The fuel manifold pressure sensor in the rail monitors fuel pressure. The engine ECM uses data from the
fuel pressure sensor to control a solenoid in the pump in order to maintain the desired fuel pressure in the rail.
Excess fuel returns to the fuel tank through a one-way return valve. The fuel injection pump is not serviceable.
Only personnel who have had the correct training should adjust pump timing.
5. The fuel system has a primary (Figure 10, Item 3), secondary (Figure 10, Item 1), and third (Figure 10, Item 2)
fuel filter. The primary filter and third filter mount on the left side of the engine. The secondary filter mounts
near the front left side of the engine. The fuel filters remove impurities in the fuel, which may damage the fuel
injection pump or the fuel injectors. A small orifice in the third fuel filter base bleeds air back to the fuel tank.