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Fuel pressure senderG247: Removing and installing > < Fuel low pressure line: check

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Fuel pressure regulator valveN276: Removing and installing
Fuel pressure regulator valve -N276-: Removing and installing
t  Fuel pressure regulator valve -N276-: Removing → Anchor
t  Fuel pressure regulator valve -N276-: Installing → Anchor.
Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.
Special tools and workshop equipment required
   
t  Engine sealing plug set -VAS 6122-, see equivalent → Anchor
t  Torque wrench
t  Insert-fixed spanner SW 30
t  Fork spanner SW 33
  W00-10435
Fuel pressure regulating valve -N276--2- is located in fuel rail. It maintains constant pressure in fuel rail and injection lines (fuel high-pressure circuit).
If the pressure in the fuel high-pressure circuit is too high, the regulating valve opens to allow some of the fuel to flow back from the fuel rail to the fuel tank via a return line.
If the pressure in the high-pressure fuel circuit is too low, the fuel pressure regulating valve -N276- closes and seals off the high-pressure section of the system from the low-pressure section.
  Note
Fuel pressure regulating valve -N276- must be renewed each time after removing.
Removing .
  WARNING
t  When carrying out work on the fuel system, always observe the guidelines for cleanliness and the instructions → Chapter.
t  Follow these instructions and rules for cleanliness before starting work and while working on the fuel system.
  A23-10406
–  Remove the engine cover upwards -arrows-.
–  Removing fuel rail → Chapter.
–  Before disassembling clean the area of the thread around the regulation valve for fuel pressure -N276- (for e.g. with a commercial cleaning agent). Under no circumstances may dirt enter the borehole of the fuel distributor.
  Note
Proceed carefully. The cleaning agent should not enter in the connection.
–  Dry fuel pressure regulating valve -N276-.
–  Slacken union nut (counterhold at hexagonal flats on housing). Then screw on by hand.
–  Extract dirt from bore of fuel rail (threads and sealing surface). No mechanical tools should be used for this purpose.
–  Seal open fuel rail bore using a bung from engine bung set -VAS 6122-.
Fitting .
l  Tightening torque → Chapter
  Note
t  The regulation valve for fuel pressure -N276- has no sealing, but a deformable metal seal and can therefore not be reused.
t  Note damage of the sealing surfaces (bite-edge sealing) and thread of the newregulation valve for fuel pressure -N276- .
t  Check sealing surface at bore in rail element.
t  Lubricate thread and deformable sealing lip of the fuel pressure regulating valve -N276- with Molybdenum grease.
–  Screw on union nut by hand.
–  Align new regulating valve so that the connecting line is free of tension after connector is attached.
–  Hold the housing of the regulation valve with a fork spanner and a clamp (for e.g. clamp for water pump) on the hexagon in this position.
–  Use suitable torque wrench with an open-end spanner insert (30 mm across flats) to tighten union nut.
–  Removing fuel rail → Chapter.
–  Let the engine run for a few minutes at average speed after the assembly and then switch it off again.
–  Check the entire fuel system for leaks.
–  Read fault memory.
After replacing the high-pressure pump or the pressure differential sender -N276-, a readopting must be carried out again. (The procedure is described under "Guided Functions".)
–  Perform a test run and depress accelerator pedal to full throttle stop at least one time. Then the tightness of the high-pressure system must be checked again.
–  Interrogate the event memory again.
  E10-10085

Fuel pressure senderG247: Removing and installing > < Fuel low pressure line: check