13 53 332 Removing and installing/replacing feed line (N74)

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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 INTAKE SILENCER HOUSING
Remove left INTAKE DUCT

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste-disposal regulations.

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

Fig 1: Sealing Off Fuel Lines Using Special Tools (13 5 160 And 13 5 162)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) on feed line retaining tab.

Fig 2: Identifying Feed Line Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release fuel feed line (4) on high-pressure pumps (1).

Release screw (2).

Release screws (3) on low-pressure fuel sensor.

Feed out and remove fuel feed line (2).

Catch and dispose of escaping fuel.

Fig 3: Identifying Fuel Feed Line, High-Pressure Pump And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Observe tightening sequence .

1. Fit fuel feed line (4).
In so doing, tighten screw connections hand-tight only .
2. Tighten down fuel feed line (4) on high-pressure pumps with torque wrench and with crowfoot wrench.
Tightening torque: see 4AZ in 13 53 FUEL INJECTION NOZZLES AND PIPES
3. Tighten down lugs (3) on fuel low-pressure sensor.
Tightening torque: see 6AZ in 13 53 FUEL INJECTION NOZZLES AND PIPES

Fig 4: Identifying Fuel Feed Line, High-Pressure Pump And Screws
Courtesy of BMW OF NORTH AMERICA, INC.
4. Tighten down retaining clips.

Tightening torque: see 7AZ in 13 53 FUEL INJECTION NOZZLES AND PIPES

Assemble engine.

Check fuel system for leaks.

Check function of DME.