Removing and installing fuel pressure regulating valve - N276-

Special tools and workshop equipment required

• Torque wrench

• Engine plug set - VAS 6122-

Fuel pressure regulating valve - N276- -5- is located on fuel rail.

»Carry out the following work sequence«

Removing

• Remove engine cover panel ⇒ 3 Engine cover panel.

Fuel rail must be removed for further work.

• Clean fuel rail (e.g. with commercial cleaning solution) before removing.
• Also thoroughly clean threaded area of fuel pressure regulating valve - N276-.

• Under no circumstances may dirt enter the hole of the fuel rail.
• It must be ensured that no cleaning agent gets into the connector housing of the fuel pressure control valve - N276-.
• Collect escaping fuel with a cleaning cloth.

• Removing high-pressure accumulator ⇒ 3.6 Assembly overview - fuel rail.
• Dry fuel pressure regulating valve - N276-.
• Counterhold on housing hexagon then loosen threaded union. Then, unscrew regulating valve by hand.
• Extract dirt from bore of fuel rail (threads and sealing surface). Do not use tools or other instruments for this purpose.

Installing

• Install new O-ring with damaging it ⇒ ETKA (Electronic Parts Catalogue).
• Tighten threaded unions of fuel pressure regulating valve - N276- by hand ⇒ ETKA (Electronic Parts Catalogue].
• Align new fuel pressure regulating valve - N276- so that connecting wire is free of tension after connector is attached.
• Counterhold on housing hexagon and tighten threaded union.

• Specified torque: assembly overview - fuel rail ⇒ 3.5 Removing and installing high-pressure lines.

• Install high-pressure accumulator ⇒ 3.6 Assembly overview - fuel rail.
• After installing, leave engine running at moderate speed for a few minutes and then switch off again.

• Check fuel system for leaks.

• Read event memory.
• Then road-test the vehicle. Accelerate with full throttle at least once, then check the high-pressure section again for leaks.
• Read event memory again.