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Removing and installing fuel pressure regulating valveN276 > < Checking fuel pressure (low pressure) system

A4 Mk3

Checking fuel pressure regulating valveN276
Checking fuel pressure regulating valve -N276-
  WARNING
t  Always read rules for cleanliness and instructions for working on fuel system → Chapter.
t  Follow these instructions and rules for cleanliness before starting work and while working on the fuel system.
–  Remove engine cover panel → Chapter.
–  Remove noise insulation from injectors.
   
–  Open hose clip -arrow- and detach fuel return line.
  A23-10338
–  Seal off open return line connection with a plug -1-.
–  Attach a suitable hose -3- to return line -2-.
  A23-10335
–  Hold this hose -1- in a suitable container -2- to measure the return flow rate.
–  Start engine and let it idle.
l  Specification: 100 ml (+/- 10 %) in 30 seconds
If specification is not obtained, fuel pressure regulating valve -N276- is defective.
If it is not possible to start engine, perform test at starter cranking speed.
l  Specification of return flow rate: 0 ml
If specification is not obtained, fuel pressure regulating valve -N276- is defective.
  A23-10336

Removing and installing fuel pressure regulating valveN276 > < Checking fuel pressure (low pressure) system