Removing and installing/replacing pressure line between fuel rail and high pressure fuel injection pump (B46/B48 4-Cyl. Engine) (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

WARNING: Observe warning on cylinder head cover.
Clamp off 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.

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

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste disposal regulations.

IMPORTANT: Adhere to conditions of absolute cleanliness when carrying out repair work 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.

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 IGNITION COILS .

Removal:

Release union nut (1).

Catch and dispose of escaping fuel.

Feed out pressure line (2) then remove it.

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Thread in pressure line (2) and install.

Manually tighten the union nuts (1).

Tighten union nut (1).

Tightening torque 13 53 6AZ .

Courtesy of BMW OF NORTH AMERICA, INC.

Required follow-up work:

Install IGNITION COILS .
Connect BATTERY EARTH LEAD .