P30 V8-6.5L DSL Turbo (1999)
Fuel Lift Pump
(1) Inlet Port
(2) Pressure Spring
(3) Primary Winding
(4) Secondary Winding
(5) Piston and Valve Assembly
(6) Inlet Valve
(7) Outlet Valve
(8) Cylinder
(9) Teflon Ring
The electric fuel lift pump mounts on the inside of the left frame rail, and is used to deliver fuel at a low pressure (at least 3 psi or 21 kPa) at the rate of
0.24 liter (½ pint) in 15 seconds (15 GPH). The lift pump is controlled by the PCM.
When the key is turned ON, the PCM energizes the fuel pump relay which sends a voltage to the lift pump. The lift pump remains during the glow plug
cycle. If the engine is not started immediately after the glow plug cycle, the PCM shuts the fuel lift pump OFF and waits until engine RPM is greater than
zero and then turns the relay back ON. As a backup system to the fuel pump relay, the fuel lift pump can also be turned ON by the fuel pump/oil pressure
switch. When the engine oil pressure reaches 28 kPa (4 psi), and the fuel pump relay does not complete the circuit, the fuel pump/oil pressure switch will
close and complete the circuit to run the fuel lift pump.
The fuel manager/filter is an in-line type filter which combines several different functions by acting as a fuel filter, a water separator, a water detector, a
water drain, and a fuel heater.
The fuel manager/filter mounts on the intake manifold at the back of the engine. The filter housing has an inlet fitting connecting to the pipe/hose from
the lift pump and an outlet fitting connecting to the fuel injection pump with a hose. A third fitting connects through a hose to a drain valve mounted on
the water crossover/thermostat housing.
The fuel manager/filter has a replaceable element. The element has an air vent valve on its top surface that is used during the lift pump diagnosis and the
filter element replacement procedure. The fuel manager/filter also has a water in fuel sensor and a fuel heater.
Fuel Filter
The fuel filter element separates particles larger than 10 microns (0.00039 in) from fuel moving through it under lift pump pressure. Filter action is very
critical to the operation of internal parts of the fuel injection pump.
Water In Fuel Sensor
The design of the fuel manager/filter includes an area that allows water droplets (as small as one micron) to separate from the fuel and collect in a lower
portion of the housing. The water in fuel sensor will detect a certain amount of water in the fuel inside of the filter housing and then turn the water the
fuel lamp ON in the instrument cluster.
When the ignition switch is first turned to the run position, the water in fuel lamp will come ON for 2 to 5 seconds. This action provides a bulb check.
