13 53 334 Removing and installing/replacing pressure line between rail and high pressure pump (N20)

WARNING: Observe warning on cylinder head cover.
Disconnect NEGATIVE BATTERY 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.

IMPORTANT: Wear full face guard and protective gloves.
Fuel can emerge spontaneously at high speed when the high pressure line is released!

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 lines or separate components.
Use only fluff-free cloths.
Seal all fuel system openings with protective caps or plugs.

IMPORTANT: Ignition coils must not be contaminated 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 ACOUSTIC COVER .
Remove COWL PANEL COVER .

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 screw (1).

Lever out cable clip (2).

Remove cover (3).

Fig 1: Identifying Cable Clip, Cover And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Undo screw (2) from cable clip (3) at rear.

Lift out cable clip (3).

Fig 2: Identifying Cable Clip And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nuts (1).

Unclamp pressure line (2) from bracket and remove.

Installation of pressure line is described separately from removal.

Renew pressure line (2).

Fig 3: Identifying Pressure Line And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Installing pressure line:

NOTE: The pressure line must be renewed in the course of every disassembly. Once the pressure line has been detached, it may not be used again.

Mount new pressure line (2).

Tighten nut (1) manually only.

IMPORTANT: Connect pressure line (2) without tension only.
To ensure distortion-free installation of the pressure line and to avoid damaging the thread, it must be possible for both nuts (1) to be screwed on easily by hand!

Fig 4: Identifying Pressure Line And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Follow the correct screw connection sequence.

First tighten nut on high pressure pump.
Tightening torque: 13 53 7AZ .
Then tighten the nut on the rail.
Tightening torque: 13 53 7AZ .

Assemble engine.

Check fuel system for tightness.

Check function of DME.