ROD 2208262 - Caterpillar

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.
Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component.
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Fuel transfer pump (A) Fuel inlet (B) Fuel outlet (1) Fuel transfer pump (2) O-ring seal
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Hand priming pump (3) Priming button (4) Fuel filter baseUse the following procedures in order to remove air from the fuel system:
Loosen the nuts on the fuel lines to the fuel injection nozzles.
Operate priming button (3) of the fuel filter base until fuel that is free from air flows from the fuel injection nozzles. Then, tighten the nuts on the fuel lines for the fuel injection nozzles. Refer to Specifications, "Fuel Injection Lines" for the correct torque.
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Typical example (5) Vent screw (6) Fuel injection pump
Loosen vent screw (5) on fuel injection pump (6). Operate priming button (3) on the fuel filter base until fuel that is free from air flows from the vent screw. Tighten the vent screw to a torque of 6 1 N m (53 9 lb in).
Start the engine. Check all the fuel lines and the components for leaks if the engine runs properly and the engine stops or the engine begins to run roughly. Air probably entered the fuel system in the low pressure side.