13 53 540 Replacing, sealing fuel hoses

WARNING: The fuel in the fuel lines is under pressure (approx. 3-5 bar)!

Recycling

Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.

Version with hose clamps:

Release hose clamps.

Remove hoses (1) and (2).

Fig 1: Removing Hoses

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Installation:

Fuel hoses and hose clamps must be replaced each time they are removed!

Version With Compressed Air Connection:

Blow fuel back into tank with a short blast of compressed air (max. 3 bar) at compressed air connection (1).

Fig 2: Locating Compressed Air Connection

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Version, Fuel Hoses Without Integrated Unlocking Facility:

Unlock fuel hoses with special tool 16 1 050 and detach hoses.

Fig 3: Unlocking Fuel Hose (Without Integrated Unlocking Facility)

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Installation:

Check O-ring in fuel hose and sealing surfaces on fuel lines for damage; replace components if necessary.

Coat O-ring for assembly with anti-friction agent.

Version, Fuel Hoses With Integrated Unlocking Facility:

Press fuel hose (1) downwards and keep pressed.

Fig 4: Disconnecting Fuel Hose (With Integrated Unlocking Facility - 1 Of 2)

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Press unlocking ring (2) upwards, keep pressed and detach fuel hose (1).

Fig 5: Disconnecting Fuel Hose (With Integrated Unlocking Facility - 2 Of 2)

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Installation:

Check O-ring in fuel hose and sealing surfaces on fuel lines for damage; replace components if necessary.

Coat O-ring for assembly with anti-friction agent.

M43, M44:

Cars with screw-mounted fuel feed line (2):

Follow installation instructions (1) and (2).

Installation Instruction 1:

Always replace fuel hose (1) and hose clamps once they have been removed.

Fig 6: Replacing Fuel Hose (Screw Mounted Clamps)

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M43, M44:

Installation instruction 2:

Always replace O-ring. Coat O-ring with anti-friction agent.

Clean sealing faces of fuel feed line.

If necessary, replace fuel feed line.

Tightening Torque, refer to 13 53 4AZ in FUEL SYSTEM - TIGHTENING TORQUES .

Fig 7: Replacing Fuel Feed Line

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Seal Off Fuel Hoses:

Fuel hoses with hose clamps:

Seal hoses with special tool 13 3 010.

Fig 8: Sealing Hoses With Special Tool

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Installation:

Fuel hoses and hose clamps must be replaced each time they are removed!

Fuel Hoses With Quick-Release Couplings:

Seal fuel hoses (1) with special tool 13 5 281.

Seal fuel lines (2) with special tool 13 5 282.

Fig 9: Sealing Fuel Lines (With Quick-Release Couplings)

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Installation:

Check O-ring in fuel hose and sealing surfaces on fuel lines for damage; replace components if necessary.

Coat O-ring for assembly with anti-friction agent.