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| After pressure has built up, close cut-off tap -A-. |
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| Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3.0 bar. |
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| Pressure retention valve in fuel pump defective; renew fuel delivery unit → Chapter. |
If the pressure does not drop: |
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| Pressure retention valve in fuel filter is OK, pressure limiting valve in fuel filter is defective. Renew fuel filter. |
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