What is the difference between a mechanical pump engine and an electronic fuel injection engine?

[McSteven]

The differences between a mechanical pump engine and an electronic fuel injection engine are as follows: Different fuel supply methods: The fuel supply system of a mechanical pump engine is mechanically controlled and not regulated by the ECU; the fuel injection system of an electronic fuel injection engine is electronically controlled, and this fuel injection system is regulated by the ECU. Different operating methods: When starting an electronic fuel injection engine (including cold starts), it is generally unnecessary to press the accelerator. This is because electronic fuel injection engines are equipped with cold start enrichment and automatic fast idle functions for cold starts, ensuring smooth engine starts whether the engine is cold or warm; a mechanical pump engine, however, requires pressing the accelerator.