13 53 334 Removing and installing/replacing pressure line

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

WARNING: Observe warning on cylinder head cover.
Disconnect BATTERY NEGATIVE TERMINAL (risk of fire due to short-circuiting on removal).
Electric fuel pump starts up automatically each time 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 velocity 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 pipes or individual components.
Use only fluff-free cloths.
Seal all fuel system openings with protective caps or plugs.
High-pressure lines may be rescrewed a maximum of 10 times.

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.

Release nuts (1 and 2).

Unscrew bolt (3).

Disconnect high-pressure line (4).

Seal connections of high-pressure line (4) with matching plugs from special tool kit 32 1 270 .

Fig 1: Identifying Nuts, Bolt And High-Pressure Line

Courtesy of BMW OF NORTH AMERICA, INC.

Seal fuel line connection of high-pressure pump (1) and high-pressure rail with matching plugs from special tool kit 32 1 270 .

Fig 2: Identifying High-Pressure Pump With Special Tool Kit 32 1 270

Courtesy of BMW OF NORTH AMERICA, INC.

Installing pressure line:

Installation of pressure rail is described separately from removal.

Copper seals that may be fitted (1) are no longer needed and must be removed.

If reusing the pressure line, apply a light coating of gear oil to threads of pressure connections. New pressure lines are already coated.

Fig 3: Identifying Copper Seals

Courtesy of BMW OF NORTH AMERICA, INC.

Install delivery line (4).

In so doing, tighten screw connections (1 to 3) hand-tight only.

IMPORTANT: Connect pressure line (4) 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 and 2) to be screwed on easily by hand!
If the nuts cannot be screwed on easily by hand, the high-pressure pump must be slackened.
This operation is described in the following information.

Fig 4: Identifying Nuts, Bolt And High-Pressure Line

Courtesy of BMW OF NORTH AMERICA, INC.

Only if high-pressure pump has to be slackened:

Slacken screws with special tool 11 8 610 .

Turn high-pressure pump (1) on flange so that nuts of high pressure line can be easily screwed on by hand.

Tighten down screws. Tightening torque 13 51 1AZ .

Fig 5: Identifying High-Pressure Pump With Screws And Special Tool 11 8 610

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Follow sequence of screw connections:

Tighten down nut (1) with special tool 13 5 020 . Tightening torque 13 53 7AZ .
Tighten nut (2). Tightening torque 13 53 7AZ .
Tighten down screw (3) for holder. Tightening torque 13 53 2AZ .

Fig 6: Identifying Nuts, Screw And High-Pressure Line
Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check fuel system for leaks.

Check function of DME.