0 5 10 15 20 25 30 35 40 Psi 5 10 15 20 25 30 35 40 45 0 50 Psi Fuel control Fuel injectors Unmetered fuel pressure Throttle body Idle speed stop screw Metered fuel pressure Manifold valve assembly Idle mixture adjust To aircraft gauge Fuel pump assembly Vapor return Fuel return Fuel inlet  from fuel tank Drain Adjustable orifice Low pressure  relief valve Bypass Inlet fuel from ACFT Unmetered fuel pressure Metered fuel pressure Return fuel from fuel control Nozzle pressure Vapor return Fuel pump inlet Vapor return Low pressure relief valve Mixture control Adjustable orifice Engine mount flange Dry bay inspection drain Fuel pump outlet Figure 2-40.  Fuel pump. Figure 2-39.  Continental/TCM Fuel-Injection System.  2-26