What are the reasons that may cause the engine to fail to start normally?

[LaAllie]

The reasons that may cause the engine to fail to start normally include: damaged fuel pump, clogged filter, weak battery, faulty starter motor, etc. For diagnosing such engine starting failures, the first step is to check the battery. It is essential to determine whether the engine's failure to start is due to insufficient battery power. If the battery is confirmed to be the issue, it needs to be recharged or replaced with a new one. Additionally, the circuits in the engine starting system should also be inspected. An engine is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, electric motors, etc. For example, an internal combustion engine typically converts chemical energy into mechanical energy. The term 'engine' can refer to both the power-generating device and the entire machine including the power unit.