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Removing and installing differential pressure sensor > < Removing and installing fuel pressure regulating valve

Golf Mk6

Removing and installing fuel pressure sender
Removing and installing fuel pressure sender
   
Fuel pressure sender -G247--item B- is located in fuel rail. It measures the current fuel pressure in the high-pressure system and transmits a voltage signal to the engine control unit -J623-.
Special tools and workshop equipment required
  N15-10500
t  Engine bung set -VAS 6122-
Removing
  WARNING
t  Read rules for cleanliness and the instructions for working on the fuel system → Chapter.
t  Always follow these rules for cleanliness and instructions before starting work and while working on the fuel system.
–  Remove engine cover panel → Chapter.
–  Before removal, clean thread area around fuel pressure sender using e.g. a commercially available cold cleaning solvent. No dirt must enter bore.
  Note
Clean carefully; cleaning solvent must not enter the electrical connector.
–  Dry fuel pressure sender -G247-.
–  Detach electrical connector -item B- from fuel pressure sender -G247-.
  W00-10435
–  Unscrew fuel pressure sender -G247-.
–  Use suction device to extract dirt from fuel rail bore (threads and sealing surface). Do not use tools or other instruments for this purpose.
–  Seal open fuel rail bore using a bung from engine bung set -VAS 6122-.
Installing
l  Specified torques → Chapter „Assembly overview - injectors“.
  Note
t  Fuel pressure sender -G247- has a deformable sealing lip, not a seal, for sealing purposes.
t  Check that sealing surfaces (deformable sealing lip) and threads on fuel pressure sender -G247- are undamaged. Reusing fuel pressure sender -G247- if possible if it has been tested OK.
t  Check sealing surface at fuel rail bore.
t  Start of thread and deformable sealing lip of fuel pressure regulating valve -N276- must be moistened with diesel.
–  Tighten fuel pressure sender -G247- by hand.
–  Then tighten fuel pressure sender -G247- to specified torque.
–  After installing fuel pressure sender -G247-, allow engine to run at moderate speed for a few minutes in order to bleed the fuel system.
  Note
The high-pressure connections must „not“ be opened for bleeding; fuel system bleeds itself automatically.
–  Read out event memory and, if necessary, delete it → Vehicle diagnosis tester.
–  Switch off ignition.
–  Carefully check entire fuel system for leaks.
–  Renew the affected component if leakage still occurs after tightening to the correct torque.
–  Then road-test the vehicle. Accelerate with full throttle at least once, then check the high-pressure section again for leaks.
  Note
If there is any air left in the fuel system, the engine may switch to the backup mode ('emergency running' mode) during the road test. Switch off engine and clear event memory. Then continue road test.
–  Read event memory again.
  N15-10500

Removing and installing differential pressure sensor > < Removing and installing fuel pressure regulating valve