What are the reasons for high fuel consumption in diesel vehicles?

[SavannahLee]

Diesel vehicles have high fuel consumption due to low fuel pump pressure, poor atomization of fuel injectors, and low cylinder pressure in the engine. The following is a detailed analysis of the specific conditions: 1. Low fuel pump pressure: Poor sealing caused by low fuel pump pressure increases the effective stroke of the high-pressure fuel pump during operation, leading to incomplete combustion of diesel and resulting in high fuel consumption. The higher the internal pressure and better the sealing of the high-pressure fuel pump, the more fuel-efficient it is. 2. Poor atomization of fuel injectors: Better atomization and finer spray holes lead to better fuel efficiency. Worn injector nozzles with poor sealing produce a linear spray, which consumes significantly more fuel than atomized spray. When diesel enters the engine and cannot burn in time, it is expelled, leading to high fuel consumption. 3. Low cylinder pressure in the engine: Low cylinder pressure and poor sealing of valves causing air leakage result in high fuel consumption. Excessive water temperature in the diesel engine lowers the compression ratio, causing some diesel to be expelled due to high temperatures, thereby increasing fuel consumption.