13 53 332 Removing and installing/replacing feed line (N54)

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WARNING: Disconnect BATTERY NEGATIVE LEAD (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 protective goggles.

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.

IMPORTANT: Ignition coils must not be fouled by fuel.

The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail!

Cover ignition coil with suitable means.

Necessary preliminary tasks

Remove INTAKE AIR MANIFOLD

Recycling

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste-disposal regulations.

Unlock and detach fuel line (1).

Catch and dispose of escaping fuel.

Fig 1: Identifying Fuel Line, Slacken Nut And Screw

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Seal fuel lines with special tools (1) 13 5 161 and (2) 13 5 162.

Fig 2: Identifying Seal Fuel Lines With Special Tools (13 5 161) And (13 5 162)

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Slacken nut (2).

Release screw (3).

Remove feed line.

Close off feed line and high-pressure pump with a matching plug from special tool kit 32-1270 PLUG .

Fig 3: Identifying Fuel Line, Slacken Nut And Screw

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Installation

Follow sequence of screw connections:

Tighten down nut (2) with special tool 13 5 020 .

Tightening torque 13 53 6AZ .

Replace aluminum screw (3).

Tighten down screw (3).

Tightening torque 13 53 9AZ .

Connect fuel line (3).

Fig 4: Tightening Down Nut And Screw Using Special Tool (13 5 020)

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Assemble engine.

Check fuel system for leaks.

Check function of DME.