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The fuel system for the 7.3L direct injection turbo (DIT) diesel:
The electric fuel pump:
Excess fuel is returned to the fuel tank through the fuel return hose.
Fuel Filter/Water Separator
The diesel engine is equipped with a fuel filter and water separator assembly. Drain the water from the fuel filter at the recommended maintenance intervals. Refer to the Service Guide for the maintenance intervals.
A water in fuel indicator on the instrument panel will alert the operator. When the indicator glows continuously while the engine is running, drain the water from the fuel filter and water separator bowl as soon as possible to prevent damage to the fuel injection system. For additional information, refer to Draining - Fuel Filter Water in this section.