B - Pressure Test In The Fuel Supply Line
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- Connect the measuring setup as if measuring the delivery quantity.
- Vehicle Diagnostic Tester still connected.
-- Turn the Pressure Tester Kit:VAS6550 -1- on by pressing the On/Off button.
-- Open the shut-off valves -A and B-.
- The levers point in the direction of flow.
CAUTION:
Risk of fuel leak.
- The shut-off valve -C- must be closed.
- The lever is perpendicular to the direction of flow.
-- Press Start on the Vehicle Diagnostic Tester display: The fuel pump starts running.
-- If the fuel flows without bubbles, close the drain -B-, so that the fuel pressure increases.
- The lever is perpendicular to the direction of flow.
-- Read the fuel pressure in the Pressure Tester Kit:VAS6550 :
- Specified value: 5.0 to 8.0 bar
-- Press the Stop button.
If Specified Value Is Obtained, Although the Fuel Delivery Unit Is Not OK.
- Fuel filter in the locking flange is blocked or the fuel supply line is crushed.
If the Specification Is Not Attained:
- Fuel delivery unit or fuel pressure regulator (in the locking flange) is faulty.