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Checking the tandem pump for tightness (internal) > < Checking feed pressure of tandem pump, vehicles with engine identification characters BKD, AZV

Octavia Mk2

Checking feed pressure of tandem pump, vehicles with engine identification characters BMM
Checking feed pressure of tandem pump, vehicles with engine identification characters BMM
Special tools and workshop equipment required
t  Tandem pump testing device, e.g. -VAS 5187- with hollow screw -VAS 5187/1A-
t  Hose clamps -MP 7-602 (3094)-
t  Pliers for spring strap clamps
Test conditions
l  Coolant temperature must be at least 85°C.
l  Unit injectors O.K.
l  The fuel filter and fuel lines must not be blocked.
Procedure
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe the regulations concerning cleanliness when working on the fuel supply/injection system → Chapter.
–  Remove engine cover → Chapter.
–  Remove air filter → Chapter.
   
–  Release screw plug -arrow-.
  S20-0188
–  Connect tandem pump testing device -VAS 5187- with hollow screw -VAS 5187/1A-, as shown.
–  Install air filter and connect suction and air guide hose.
–  Connect air mass meter -G70-.
–  Start engine and run in idle.
–  Observe the pressure displayed on the tandem pump testing device.
l  Specified value: at least 0.35 MPa (3.5 bar).
–  Engine speed must increase to 4000 rpm.
–  Observe the pressure displayed on the tandem pump testing device.
l  Specified value: at least 0.75 MPa (7.5 bar).
If the specified value is not reached:
–  Press together fuel return-flow line between tandem pump and fuel filter with hose clamp -MP 7-602 -.
–  Observe the pressure displayed on the tandem pump testing device.
l  Specified value: at least 0.75 MPa (7.5 bar).
If the specified value is now reached:
Pressure loss at the unit injectors.
–  Replace O-rings for unit injectors → Chapter.
If the specified value is not reached:
–  Replace tandem pump → Chapter.
  Note
After removing the tandem pump tester tighten the screw plug to 25 Nm. Always replace the gasket ring.
  S20-0221

Checking the tandem pump for tightness (internal) > < Checking feed pressure of tandem pump, vehicles with engine identification characters BKD, AZV