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Fuel flow: checking > < Injection flow and seal: checking

Leon Mk2

Verify the airtight seal
Verify the airtight seal
  WARNING
Fuel system is under pressure! Wear safety goggles and appropriate clothing to avoid injury and contact with skin. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.
Test requirements
l  Fuel pressure must be correct, check: → Chapter.
   
–  Pull off connectors -arrows- from all the injectors.
–  Unclip the cable harness from the injectors.
–  Remove the fuel rail from the intake manifold.
–  Remove the fuel rail together with the injectors from the intake manifold. (The fuel pipes remain connected).
–  Fold down the rear seat forwards.
–  Remove cover from fuel delivery unit.
  N15-10082
–  Using the auxiliary cables of the auxiliary measuring set -V.A.G 1594C-, connect the V.A.G 1348 remote control -V.A.G 1348/3A- to contact -5- of the fuel pump and to the (+) positive terminal of the battery.
–  Join contact -5- and contact -1- of the fuel pump using the auxiliary cables of the auxiliary measuring set -V.A.G 1594C-.
  Note
This step serves only to have the fuel pump running when the engine is stopped.
–  Checking injectors for leakage (visual check). Only 1 to 2 drops per minute may emit from each injector when fuel pump is running.
If the fuel loss is greater:
–  Replace the defective injector → Chapter.
  Note
Always replace seals.
  N20-10204

Fuel flow: checking > < Injection flow and seal: checking