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| Connect the pressure gauge -VAS 6551- with hose adapter -VAS 6551/3-, fitted on the connection -C-, to the free end of the return-flow line from the injection units. |
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| Connect the hose adapter -VAS 6551/4- to the free connection on the injection unit and insert the end into a measuring glass with a volume of approx. 3 litres and hold it inside. |
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| Open the shut-off cock -C- of the pressure gauge -VAS 6551-, close the shut-off cocks -A and B-. |
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| Switch on the pressure gauge -VAS 6551- by pressing the button On/Off and gauge. |
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| Switch on the ignition and start the engine. |
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| Read the pressure on the pressure gauge -VAS 6551-. |
| Specified value: min. - 0.10 bar |
| If the specified value is not reached: |
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| First of all, test the fuel pressure in the fuel return-flow line in the low pressure area and if necessary, repair this return-flow line → Chapter. |
| If the specified value is also not reached although the fuel pressure in the fuel return-flow line in the low pressure area is correct: |
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| Replace the fuel return-flow line from the injection units to the high pressure pump. |
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