COVER 3391497 - Caterpillar

Priming the Fuel Filters
The priming pump plunger is located on the right side of the machine in the engine compartment.
Open the engine hood.
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Turn the priming pump plunger counterclockwise and pull out the priming pump plunger in order to unlock the priming pump plunger.
Operate the priming pump plunger in order to fill the new fuel filter elements with fuel. Continue pumping until a resistance is felt. The resistance indicates that the fuel filters are full of fuel.
Push in the priming pump plunger and turn the priming pump plunger clockwise. This will lock the priming pump plunger in place.
Start the engine. Check for leaks.
Stop the engine. Close the engine hood.Priming the Fuel System
Note: If the engine will not start or the engine runs rough after the priming of the fuel filters, prime the injection pumps and the high pressure lines.
The fuel injection nozzles can be permanently damaged by twisting if only one wrench is used to loosen or tighten the fuel line nuts.Use one wrench to hold the nozzle and another to loosen the nut.
The fuel injector pumps and the high pressure lines are located on the right side of the machine in the engine compartment.
Start the engine and run the engine at low idle.
If the engine will not start, crank the engine and perform the following steps at the same time.
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Loosen one fuel injector line at a time at the cylinder head until the fuel flows free of air bubbles.
Tighten the fuel line nuts to a torque of 40 7 N m (30 5 lb ft). Use a second wrench on the nozzle to prevent damage.
Check for leaks. Clean up any excess fuel.
Stop the engine.