13 53 332 Removing and Installing/Replacing Feed Line

13 53 332 Removing And Installing / Replacing Feed Line (N53, N54, N54T)

Special tools required:

WARNING:
Disconnect negative battery terminal (risk of fire due to short circuit on dismantling).
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.







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







Necessary preliminary tasks:
- Remove intake plenum.







Recycling:
Fuel escapes when fuel lines are detached.
Catch and dispose of escaping fuel in a suitable container.
Observe country-specific waste disposal regulations.







N53 only:
Lay exhaust gas recirculation (1) upwards to one side. Do not remove.







Unlock connector (1) and remove.
Unlock and detach fuel line (2).
Catch and dispose of escaping fuel.







Seal fuel lines with special tools 13 5 281 and 13 5 282 .







Slacken nut (1).
Release screw (2).
Remove feed line (3).







Close off feed line and high pressure pump with a matching plug from set of special tools 32 1 270.







Installation note:
Feed lines with a soldered bracket must be replaced by the new version with elastomer clamp holder. Observe installation position of fuel low-pressure sensor. Lines for solenoid switches are laid behind fuel line.

Install feed line (3).
In so doing, tighten screw connection hand-tight only

IMPORTANT:
Follow sequence of screw connections:

1. Tighten down nut (1) with special tool 13 5 020. Tightening torque 13 53 6AZ.
2. Tighten screw (2). Replace aluminium screw, continue to use only screws with yellow thread-locking sealant. Tightening torque 13 53 9AZ.







Assemble engine.
Check fuel system for tightness.
Check function of DME.