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

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

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel at a high velocity to facilitate atomization
All of these
Ensure that penetration is not high
Inject fuel in a chamber of high pressure at the end of compression stroke

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