Entire System Pressure Test
-- Disassemble the Diesel Pressure Tester Kit - Pressure Regulator Valve:VAS 6551/6 and remove it with the measuring container.
- Fuel delivery rate and pressure test in the fuel supply is OK.
- Diesel Pressure Tester Kit - Hose 2:VAS 6551/2 is connected to the fuel supply line and the Diesel Pressure Tester Kit:VAS 6551 .
- Vehicle Diagnostic Tester is connected.
-- Connect the Diesel Pressure Tester Kit - Hose 1:VAS 6551/1 on the fuel supply hose leading to the fuel filter and to the Diesel Pressure Tester Kit:VAS 6551 .
TIP:
The Diesel Pressure Tester Kit:VAS 6551 is switched on in the fuel supply line.
-- Switch on the Diesel Pressure Tester Kit:VAS 6551 -item 1- by pressing the On/Off button.
-- Open the shut-off valves -A and B-.
- The levers point in the flow direction.
-- Close the shut-off valve -C-.
- The lever is perpendicular to the flow direction.
-- Connect the Vehicle Diagnostic Tester.
-- Switch the ignition on.
-- Select Diagnostic and start.
-- Select the Select individual test button and select the following tree structure consecutively:
- Diagnostic-capable systems
- 0001 - Engine Electronics
- 0001 - basic setting
- Transfer fuel pump test
-- Press Start .
- The fuel pump starts.
-- Read the fuel pressure on the Diesel Pressure Tester Kit:VAS 6551 .
- Specified value: minimum 3.7 bar
If the specified value is not reached, although the fuel delivery rate was OK:
- The high pressure pump overflow valve is not OK
If specified value is not reached:
- The fuel filter and fuel return line is blocked or kinked.
Assembling
Assemble in the reverse order of removal. Note the following:
- The ignition must be off.
- Decrease the fuel pressure by opening the shut-off valves -B and C- and letting the fuel run into the measuring container before removing the pressure gauge -1-.
-- Remove the Diesel Pressure Tester Kit:VAS 6551 with the connecting lines.
-- Connect the hose coupling and pull on it to make sure the fuel supply line is secured correctly.