Reducing pressure in high-pressure section of injection system |
WARNING The fuel system operates at extremely high pressure. This can cause injury. |
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| The injection system consists of a high-pressure section (maximum approx. 140 bar) and a low-pressure section (approx. 7 bar). |
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| Prior to opening the high-pressure section (e.g. when removing the high-pressure pump, fuel rail, injectors, fuel pipes or fuel pressure sender -G247-), the fuel pressure in the high-pressure section must be reduced to a residual pressure of approx. 7 bar. The procedure is described below. |
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Reducing fuel pressure in high-pressure section: |
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| Start engine and run at idling speed. |
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| Select „Engine electronics“ in vehicle self-diagnosis. |
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| Then select „Measured values“. |
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| Select „Fuel pressure“ from the list. |
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| With the engine idling, the fuel pressure displayed will be between 30 and 40 bar. |
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