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

A3 Mk2

Checking delivery rate of fuel pumps
Checking delivery rate of fuel pumps
Special tools and workshop equipment required
t  Measuring container (fuel-resistant)
Test conditions:
l  Battery voltage at least 12.5 Volt.
l  Fuel filter OK.
l  Fuel tank at least 1/2 full.
l  Ignition switched off
Checking fuel delivery rate
–  Remove engine cover panel → Chapter.
  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.
t  To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection.
   
–  Release hose clip and detach fuel supply line -arrow- from high-pressure pump.
  A23-10321
–  Hold fuel supply line -1- into a measuring container -2-.
–  Connect a → Vehicle diagnostic tester.
–  Switch on ignition.
–  Select „Engine electronics“ in vehicle self-diagnosis.
–  Then select „Basic setting“.
–  Select „Checking fuel system pressurisation pump“ from the list.
–  Press „Start“ key: The fuel pump will start running.
–  Let fuel pump run for 15 seconds and exit activation function.
l  Specification in 15 seconds: at least 600 ml
If minimum delivery rate is not reached, check for the following causes:
t  Fuel pump was not running for 15 seconds
t  Fuel lines have been crushed
t  Fuel filter is blocked
t  Fuel pumps defective: Checking → Rep. gr.20
  Note
Check fuel system for leaks.
  A23-10322

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