13 53 332 Removing and installing/replacing feed line (N63)

Special tools required:

WARNING: Disconnect BATTERY NEGATIVE TERMINAL (risk of fire due to short-circuiting on removal).
Electric fuel pump starts up automatically when door is opened!
Carry out installation work on fuel system only with coolant temperature below 40 °C.

Wear safety goggles.

Wear protective gloves.

IMPORTANT: Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.
Introduced contaminants can cause malfunctions in the system!

Do not allow any dirt particles or foreign bodies to get into the system.
Remove all traces of dirt before removing pipes or individual components.
Use only fluff-free cloths.
Seal all fuel system openings with protective caps or plugs.

Necessary preliminary tasks:

Remove LEFT AND RIGHT INTAKE FILTER HOUSINGS .

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste-disposal regulations.

Release clamps (1) and (2).

Replace clamps (2).

Detach both charge-air ducts (3) and remove.

Check gaskets on turbocharger, replacing if necessary.

Fig 1: Identifying Charge-Air Ducts And Clamps

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Picture shows the left side, the procedure for the right side is identical.

Detach hoses (1) from clean-air pipe.

Release screw (2).

Tightening torque 13 71 1AZ .

Detach clean-air pipe (3) in direction of travel from turbocharger.

Check seal on clean-air pipe, replacing if necessary.

Fig 2: Identifying Clean-Air Pipe, Hoses And Screw

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Unlock and disconnect fuel feed line (1).

Seal fuel lines with special tools 13 5 160 and 13 5 162 .

Unlock and disconnect plug (2) on fuel low-pressure sensor.

Release fuel feed line (3) on high-pressure pump.

Tightening torque 13 53 4AZ .

Release screws (4).

Tightening torque 13 53 6AZ .

Catch and dispose of escaping fuel.

Fig 3: Identifying Fuel Feed Lines, Plug, And Screws

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Seal fuel lines with special tools (1) 13 5 160 and (2) 13 5 162 .

Fig 4: Identifying Seal Fuel Lines With Special Tools (13 5 160 And 13 5 162)

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Release fuel feed line (1) on high-pressure pump.

Tightening torque 13 53 4AZ .

Catch and dispose of escaping fuel.

Fig 5: Identifying High-Pressure Pump Fuel Feed Line

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Release nuts (1) on retaining clips.

Tightening torque 13 53 7AZ .

Feed out and remove fuel feed line (2).

Fig 6: Identifying Fuel Feed Line And Nuts

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Installation:

Observe tightening sequence .

Fit fuel feed line.
In so doing, tighten screw connections hand-tight only .
Tighten down fuel feed line (1) on high-pressure pumps to torque (2) and with crowfoot wrench (3).
Tightening torque 13 53 4AZ .
Tighten down lugs on fuel low-pressure sensor.

Fig 7: Tightening Fuel Feed Line On High-Pressure Pumps
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Tightening torque 13 53 6AZ .
Tighten down retaining clips.
Tightening torque 13 53 7AZ .

Assemble engine.

Check fuel system for leaks.

Check function of DME.