RETAINER 4399517 - Caterpillar

Illustration 1 g00578564
Typical exampleLeft side of engine
Illustration 2 g00578614
View A-AFront of engine (1) Fuel outlet to tank (2) Fuel inlet (3) Pressure relief valve (4) Cylinder head (5) Drilled passage (6) Tube assembly (7) Tube assembly (fuel transfer pump to fuel filter) (8) Check valve assembly Minimum fuel system pressure at low idle ... 50 kPa (7.2 psi)The check valve assembly (8) maintains the minimum fuel system pressure. The check valve assembly (8) prevents fuel from draining from the fuel system.Note: Refer to the System Operation, Testing and Adjusting, "Fuel System - Inspect" for the correct method of inspecting fuel pressure. (9) Screen assembly (if equipped) (10) Fitting (11) Fuel gallery (12) The pressure regulating orifice maintains the following fuel system pressure. Maximum fuel system pressure at rated rpm ... 400 kPa (58 psi) Minimum fuel system pressure at rated rpm ... 140 kPa (20 psi)Note: The pressure regulating orifice is a drilled passage (5) in tube assembly (6).