ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 006-013   Fuel Drain Lines

Inspect the drain lines for any signs of leaks, cracks, chafing, or loose or broken brackets.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

WARNING  When using a steam cleaner, wear safety glasses or a face shield, as well as protective clothing. Hot steam can cause serious personal injury.

CAUTION  Clean all fittings before disassembly. Dirt or contaminants can damage the fuel system.

Before servicing any fuel system components, (such as fuel lines, fuel pump, injectors, etc.) which would expose the fuel system or internal engine component to potential contaminants prior to disassembly, clean the fittings, mounting hardware, and the area around the component to be removed. Dirt or contaminants can be introduced into the fuel system and engine if the surrounding areas are not cleaned, resulting in damage to the fuel system and engine. Refer to Procedure 000-009 in Section 0.

WARNING  Fuel is flammable. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area and areas sharing ventilation to reduce the possibility of severe personal injury or death when working on the fuel system.

WARNING  Do not vent the fuel system on a hot engine; this can cause fuel to spill onto a hot exhaust manifold, which can cause a fire.

There are two drain lines on the engine:

1. The fuel injection pump drain line routes fuel from the fuel injection pump to the fuel lift pump drain manifold. This line has a p-clip brace that attaches to the cylinder head.
2. The injector drain line which routes fuel from the rear of the cylinder head to the fuel lift pump drain manifold.

These lines are removed by removing the banjo bolts and sealing washers.

WARNING  Fuel is flammable. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area and areas sharing ventilation to reduce the possibility of severe personal injury or death when working on the fuel system.

WARNING  Do not vent the fuel system on a hot engine; this can cause fuel to spill onto a hot exhaust manifold, which can cause a fire.

CAUTION  Use caution when disconnecting or removing fuel lines, replacing filters and priming the fuel system that fuel is not spilled or drained into the bilge area. Do not drop or throw filter elements into the bilge area. The fuel and fuel filters must be discarded in accordance with local environmental regulations.

There are three drain lines on the engine:

1. The fuel pump drain line connects the fuel pump to the fuel drain manifold. This line has a p-clip brace that attaches to the engine cylinder head.
2. The fuel rail pressure relief valve drain line connects the fuel rail pressure relief valve to the fuel drain manifold.
3. The injector drain line connects the back of the cylinder head to the fuel drain manifold.

These lines are removed by removing the banjo bolts and sealing washers.

NOTE: QSL9 marine applications, which are keel cooled, do not have fuel coolers.

QSC8.3 and QSL9 marine applications, which are sea water cooled, have an additional drain line which transfers the fuel from the fuel drain manifold to the fuel cooler.

This line is removed by loosening the compression nuts.

Inspect the lines for damage.

Inspect the banjo seal washers for damage.

Connect the fuel drain line at the fuel pump banjo fitting at the rear of the cylinder head and at the lift pump. Use two (2) wrenches when installing the drain line at the fuel pump return.

Use the following procedure for air bleeding installation. Refer to Procedure 006-056 in Section 6.

Install and tighten the clamp capscrews.

Install the three drain lines on the engine.

High pressure fuel pump drain:

• Install the p-clip bracket
• Install the banjo bolt at the fuel drain manifold
• Install the banjo bolt at the fuel pump.

Pressure relief valve drain line:

• Install the banjo bolt at the fuel drain manifold
• Install the banjo bolt at the pressure relief valve. Hold the line so that it will not twist and wear against the bottom of the cylinder head.

Injector drain line.

On marine applications, install the additional fuel drain line from the fuel drain manifold to the fuel cooler.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Connect the batteries. Refer to the OEM service manual.
• Operate the engine and check for leaks.