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During starting of the engine the safety valve blows causes

1. Defective fuel oil valves.
2. Wrong fuel pumps timings.
3. The opening pressure of the safety valve is low caused by a broken spring or a loosened nut.
4. Engine is over cooled.
5. Fuel linkage problems or fuel rack stuck in maximum position.
6. Dripping fuel injectors.

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Why atomisation test should not be done in slide type fuel valves

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