TM 9-2815-250-24&P 1-12. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. Key Component Description 1 Intake Manifold Provides fresh air to cylinders for combustion. 2 Fuel Injectors (2) Supply fuel to cylinders. 3 Rocker Arm Covers (2) Protect rocker arm assemblies. 4 Fuel Pressure Pipes (2) Provide fuel to fuel injectors. 5 Filler Cap Allows access to filler neck. 6 Filter Element Removes impurities from lubrication system. 7 Solenoid Opens and closes fuel supply. 8 Filler Neck Allows oil to be added to lubrication system. 9 Airflow Deflectors (6) Provide and direct cooling air. 1-5