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| After the pressure has built up, close the shut-off cock -A-. |
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| Observe pressure drop at pressure gauge. |
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| The pressure must not drop below 0.3 MPa (3.0 bar) after 10 minutes. |
If the pressure still drops: |
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| Non-return valve in the fuel pump faulty, replace fuel delivery unit: |
If the pressure does not drop: |
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| Pressure limiting valve in the fuel filter defective, replace the fuel filter. |
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