BOLT 4471718 - 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.
Ensure that the engine is stopped before any servicing or repair is performed.
The water separator can be under suction during normal engine operation. Ensure that the drain valve is tightened securely to help prevent air from entering the fuel system.
Place a suitable container under the water separator in order to catch any fuel that might spill. Clean up any spilled fuel.
Illustration 1 g01334411
Typical example
Install a suitable tube onto drain (1). Open drain (1). Allow the fluid to drain into the container.
Tighten drain (1) by hand pressure only. Remove the tube and dispose of the drained fluid in a safe place.
Illustration 2 g01371846
Typical example
Note: Not all primary filters require vent screw (2). This primary fuel filter that has a vent screw may be installed on a fuel system that has a low fuel tank.
Install a suitable tube onto drain (1). Loosen vent screw (2).
Open drain (1). Allow the fluid to drain into the container.
Tighten drain (1) by hand pressure only. Remove the tube and dispose of the drained fluid in a safe place.
Tighten vent screw to 6 N m (53 lb in).