What is the reason why the hand oil pump does not become hard when pressed?

[Susan]

The hand oil pump does not become hard when pressed. This situation is most likely due to air leakage in the hand oil pump. In addition, air leakage in the hand oil pump pipeline can also cause the hand oil pump to not become hard when pressed. The main reason for this situation is that when the hand oil pump leaks air, the pressure decreases, making it difficult for the fuel pump to effectively pressurize the fuel, leading to issues with the vehicle's fuel supply. Relevant information about engine oil is as follows: 1. Introduction: Engine oil, also known as engine lubricant (English name: Engine-oil), has a density of approximately 0.91×10³ (kg/m³). It serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is often referred to as the 'blood' of a car. 2. Composition: Engine oil consists of two main components: base oil and additives. The base oil is the primary component of lubricating oil, determining its basic properties. Additives are used to compensate for and improve any deficiencies in the base oil's performance, providing new characteristics, and are an essential part of lubricating oil.