All high-pressure fuel lines are of the same length and inside diameter. Correct high-pressure fuel line usage and installation is critical to smooth engine operation.Cleanliness cannot be overemphasized when handling or replacing diesel fuel system components. This especially includes the fuel injectors, high-pressure fuel lines and fuel injection pump. Very tight tolerances are used with these parts. Dirt contamination could cause rapid part wear and possible plugging of fuel injector nozzle tip holes. This in turn could lead to possible engine misfire. Always wash/clean any fuel system component thoroughly before disassembly and then air dry. Cap or cover any open part after disassembly. Before assembly, examine each part for dirt, grease or other contaminants and clean if necessary. When installing new parts, lubricate them with clean engine oil or clean diesel fuel only.

WHEN LOOSENING OR TIGHTENING HIGH-PRESSURE LINE FITTINGS ATTACHED TO A SEPARATE FITTING, USE A BACK-UP WRENCH ON FITTING. DO NOT ALLOW FITTING TO ROTATE. DAMAGE TO BOTH FUEL LINE AND FITTING WILL RESULT.Position and connect rail-to-injection pump high-pressure fuel line (12). Tighten fittings (9) and (11) to 28 N·m (20 ft. lbs.) torque.Install fuel line clamp bolt (10). Tighten bolt to 15 N·m (11 ft. lbs.) torque.Position four fuel lines (3) to engine. Tighten fuel line fittings (2) to 28 N·m (20 ft. lbs.) torque. Tighten fuel line fittings (4) to 20 N·m (15 ft. lbs.) torque.Install dress-up cover to top of engine.Connect negative battery cable to battery.