FUEL SYSTEM7-10 TNV IDI Service ManualFuel Injection Lines1 – High-Pressure Fuel Injection Lines2 – Fuel Return Line Nut3 – Fuel Return Line4 – Fuel Injector5 – Gasket6 – Protector7 – Fuel Return Hose8 – Fuel Injection Pump Drive Gear Nut9 – Lock Washer10 – Fuel Injection Pump Drive Gear Assembly(DO NOT remove or loosen the four boltsthat fasten the injection pump drive gear tothe injection pump drive gear hub!)11 – Fuel Injection Pump12 – Lube Oil Line13 – Mechanical Fuel Supply Pump (Optional onsome models)14 – Fuel Return Fitting15 – Low Pressure Fuel Inlet Fitting16 – Fuel / Water Separator17 – Electric Fuel Supply Pump18 – Fuel Filter19 – Fuel Filter MountFUEL INJECTION LINESRemoval of High-Pressure FuelInjection LinesNOTICERemove or install the high-pressure fuel injectionlines as an assembly whenever possible.Disassembling the high-pressure fuel injection linesfrom the retainers or bending any of the fuel lineswill make it difficult to reinstall the fuel lines.Note: To prevent “rounding” the fuel line nutsalways use a “line” or “flare nut” wrench.1. Close any fuel valves in the fuel supply line.2. Clean the area to keep contaminants fromentering the fuel system.3. Place a drain pan under the fuel injection pumpto catch any spillage.4. Loosen the fuel line nuts at the fuel injectionpump.5. Next, loosen the fuel line nuts at the fuelinjectors. Use one wrench to hold the fuel returnline nut and fuel return line from rotating. Use asecond wrench to loosen the fuel line nut(Figure 7-4). Repeat with the remaining fuelinjectors.Figure 7-40002237
