13 53 035 Removing and installing/replacing feed line (B48, B46)

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Special tools required:

13 5 160

WARNING: Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short circuit 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.

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste disposal regulations.

Attention !

Adhere to conditions of absolute cleanliness when carrying out repairs 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 contamination before removing lines or separate components.
Use only lint-free cloths.
Seal all fuel system openings with protective caps or plugs.

Attention !

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 .

Removal:

Release screws (1).

Release wiring harness from cylinder head cover.

Fig 1: Wiring Harness Screws

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Release screw (1).

Slightly push clean air pipe (2) to the rear and remove the sound insulation (3) of the high pressure pump.

Fig 2: Sound Insulation, Air Pipe And Screw

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Detach the fuel line at the snap fastener (1).

Close fuel lines with special tools 13 5 161 and 13 5 162 from special tool set 13 5 160 .

Release union nut (2) on high-pressure pump.

Loosen screws (3).

Do not lose rubber damper (4).

Remove feed line (5).

Fig 3: Rubber Damper, Snap Fastener, Feed Line, Screws And Union Nut

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Installation:

Re-install rubber damper (3).

Install feed line and tighten union nut (2) hand-tight on the high pressure pump.

Tighten screws (1) hand-tight.

Fig 4: Rubber Damper, Union Nut And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Ensure correct fit of the rubber damper (4)!

First tighten screws (3).

Tightening torque 13 53 5AZ .

Then tighten union nut (2) on the high pressure pump.

Tightening torque 13 53 4AZ .

Connect fuel line (1) to feed line (4).

Fuel line must audibly engage.

Carry out pull-back test on the fuel line.

Fig 5: Rubber Damper, Snap Fastener, Feed Line, Screws And Union Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Install sound insulation (3).

Fit clean air pipe (2).

Tighten screw (1).

Tightening torque: 13 71 6AZ .

Fig 6: Sound Insulation, Air Pipe And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Install wiring harness on cylinder head cover.

Tighten down screws (1).

Fig 7: Wiring Harness Screws

Courtesy of BMW OF NORTH AMERICA, INC.