Fuel System
Fig. 1 Water in fuel detector, strainer & pickup tube assembly. 1982---83 models:
Fig. 2 Fuel filter system. 1982---83 models:
Fig. 3 Fuel filter/water separator. 1984---87 G & P models:
Fig. 4 Fuel filter/water separator. 1984---87 C, K, R & V models:
COMPONENTS
The fuel system consists of a tank, fuel pickup assembly, fuel filters, mechanical fuel pump, fuel line heater, and an injection pump, injector lines and individual fuel injectors for each cylinder. On 1982---83 models, the fuel pickup incorporates a water in fuel detector, Fig. 1, primary and secondary fuel filters are used, and a water drain siphon valve is included in the system, Fig. 2. On 1984---87 models, a single fuel filter assembly is used, which includes the water in fuel sensor, water separator and drain, and the fuel heater, Figs. 3 and 4. In addition, 1984---87 models are equipped with a low pressure switch which illuminates a warning lamp should the fuel filter become clogged.
1984---87
Fuel is drawn from the tank by the camshaft drive mechanical mechanical pump. Fuel is then pumped through the fuel filter and heater assembly mounted on the front of the dash on C, K, R and V models or under the air cleaner on G and P models. In the filter, contaminants are strained out of the fuel, water is separated and the fuel is heated to prevent formation of wax deposits. From the filter fuel is delivered to the high pressure rotary vane type injection pump. The injection pump meters and pressurizes the fuel, then directs it through the injector lines to the injector nozzles. The eight high pressure injector lines are all of equal length, although their shapes may be different, in order to prevent any difference in injection timing between cylinders.
Fig. 3 Fuel filter/water separator. 1984---87 G & P models:
Fig. 4 Fuel filter/water separator. 1984---87 C, K, R & V models:
1984---87
The water separation system on these models is incorporated into the fuel filter assembly, Figs. 3 and 4. The fuel filter separates and traps water contained in the fuel, and when the water level reaches a point where it could be drawn into the system, the ``WATER IN FUEL'' lamp on the instrument panel is illuminated. In addition, the low pressure sensor on the filter outlet will also illuminate the lamp if the fuel filter becomes clogged.