Why is the small hole provided in the pump body?

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This question is part of a full practice quiz:
Automobile Engineering Practice Test: Petrol Engine Fuel System — practice the complete quiz, review flashcards, or try a random question.

A petrol engine's fuel system consists of several components that work together to transfer fuel from the tank to the engine for combustion.

The main components of the fuel system are: 
Fuel tank, Fuel pump, Fuel filter, Fuel injectors, Fuel pressure regulator, Carburetor, Fuel lines, Air cleaner, Inlet manifold, Supply and return pipelines. 
 


Why is the small hole provided in the pump body?