Check the pressure holding valve in the fuel return-flow line |
The pressure holding valve has the function to always hold a remaining pressure (control quantity) of approx. 0.1 MPa (1 bar) in the fuel return-flow line. |
The injection units (piezo injectors) require this control quantity for their function. |
Special tools and workshop equipment required |
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| Pressure gauge, e.g. -VAS 6330- |
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| Adapter, e.g. -VAS 6330/3-1- |
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| Adapter, e.g. -VAS 6330/3-2- |
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| Cleaning and degreasing agent, e.g. -D 009 401 04- |
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| Protective goggles and gloves |
Note t
| Safety precautions when working on the fuel supply system → Chapter. |
WARNING Wear protective gloves and protective googles when working with grease remover! |
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| Before removing, clean the return line connection at the injection unit of cylinder 1 with a grease remover. |
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| Dry the return line connection of cylinder 1. |
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| Cover the return line connection of cylinder 1 with a cloth. |
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