LUG 3L2789 - Caterpillar

You must read and understand the warnings and instructions contained in the Safety section of this manual before performing any operation or maintenance procedures.Fuel System
Service Filters
Fuel filter differential pressure must be monitored. An electrical monitoring device must be connected to a differential pressure switch mounted in the fuel filters priming pump adapter plate.Do not fill fuel filter housings with fuel before installing elements. Contaminated fuel will cause accelerated wear to fuel system components.
Fuel filters should be changed every 250 service hours, monthly, or when monitoring device indicates a high differential pressure, whichever occurs first. The primary fuel filter should be cleaned each time the elements are changed.Clean Primary Fuel Filter
1. Stop the engine.2. Close the fuel supply line valve. 3. Loosen nut (1) on the cover and remove case (3).4. Remove filter element (2). Wash the element and case in clean, nonflammable solvent.5. Inspect and install the two cover gaskets. Install new gaskets if necessary.6. Install the cleaned filter element and case.7. Open fuel supply line valve.8. Prime the fuel system. See "Priming the Fuel System."Change Fuel Filters
1. Stop the engine.2. Close the fuel supply line valve. 3. Use a strap wrench to remove the fuel filters.4. Clean the filter base. Be sure to remove all of the old gasket.5. Apply a light coat of clean fuel to the new filter gasket.6. Install the new filter by hand. When the seal contacts the base, tighten 3/4 turn more.
Do not overtighten the filter.
7. Open the fuel supply valve.8. Prime the fuel system. See "Priming the Fuel System."9. Start the engine and inspect for leaks.Priming the Fuel System
1. Make certain the fuel supply line valve is open. 2. Turn the pump handle knob counterclockwise. Release the lock plate from the retainer on the fuel priming pump.3. Operate the fuel priming pump until the air in the fuel system has been pumped through the fuel return line to the fuel tank.4. Push pump handle and turn pump handle knob clockwise until the lock plate and knob are tight.