| Checking pressure retention valve in fuel return line |
| The pressure retention valve maintains a residual pressure of approx. 10 bar in the return lines. |
| This residual pressure is required for the control function of the piezo injectors. |
| Special tools and workshop equipment required |
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| Tester for fuel return system -6330- |
WARNING | t
| Always read rules for cleanliness and instructions for working on fuel system → Chapter. |
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| Follow these instructions and rules for cleanliness before starting work and while working on the fuel system. |
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| Clean return line connection on cylinder 1 (with commercial cleaning solution etc.) before removing. |
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| Dry return line connection on cylinder 1. |
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| Cover return line connection on cylinder 1 with a cloth. |
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| Pull return line connection off cylinder 1; to do so, press both tabs down and at the same time pull centre piece up to release connection. |
Note | Take care to keep all components clean. No dirt must be allowed to get into the disconnected return line or the open connection on the injector. |
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