Replacing fuel low-pressure sensor (S55 engine)

Special tools required:

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

Electric fuel pump starts up automatically each time door is opened!

Carry out installation work on fuel system only with coolant temperature below 40°C.

Wear safety goggles.

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.

Necessary preliminary work:

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste disposal regulations.

Removal:

Release screws (1) under cable channel.

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Unlock connector (1) and pull off.

Release fuel low-pressure sensor (2) and remove.

Attention!

When releasing and tightening the sensor, brace against the AF of the low pressure line!

NOTE: Close off low pressure line as necessary with a fitting plug from set of special tools 32 1 270.

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Installation note:

Check sealing ring of fuel low-pressure sensor and replace as necessary.

Installation:

Install fuel low-pressure sensor (2) and tighten. Tightening torque: 13 53 5AZ .

Attach and lock connector (1).

Connector (1) must engage audibly.

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Tighten screws (1) under cable channel. Tightening torque 13 62 6AZ .

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Required follow-up work:

Assemble engine.

Check fuel system for leak tightness. Check function of DME.