Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The small difference in cooling water temperature or in internal friction has a disproportionate effect
The friction is high
The friction is unpredictable
The engine is rarely operated

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Internal Combustion Engines
In a typical medium speed, 4-stroke cycle diesel engine

Fuel injection starts at top dead center and ends at 20° after top dead center
Fuel injection starts at 10° before top dead center and ends at 20° after top dead center
Fuel injection starts at just before top dead center and ends just after top dead center
May start and end anywhere

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