What are the reasons for diesel vehicles generally consuming more fuel?
3 Answers
Diesel vehicles generally consume more fuel due to the following reasons: 1. The injector nozzles become clogged with carbon deposits from incomplete combustion during long-term use, and the air filter, idle motor, and throttle valve are too dirty; 2. The ignition module malfunctions, resulting in weak high-voltage sparks, reduced ignition capability, and incomplete combustion of some fuel mixtures, leading to increased fuel consumption; 3. The valve clearance is either too large or too small, and the valves and valve seats are eroded, preventing the valves from achieving ideal sealing, which reduces engine power. Precautions for refueling: 1. Choose to refuel when the temperature is relatively low; 2. If the vehicle is not used for a long time or used infrequently, keep a small amount of fuel; 3. Avoid refueling when a fuel tanker is unloading; 4. Turn off the engine when refueling a gasoline vehicle.
I've been driving diesel cars for several years and found there are quite a few reasons for high fuel consumption. Poor driving habits are the most common, like frequently slamming the accelerator and then braking hard - that'll definitely make fuel usage skyrocket. Another factor is inadequate vehicle maintenance. For example, when the air filter gets dirty and clogged, the engine can't breathe properly and has to consume more fuel. If the fuel injectors get carbon buildup or start leaking, the fuel injection becomes uncontrolled, burning fuel like it's free. Also, insufficient tire pressure or incorrect wheel alignment makes the car work harder while driving, secretly consuming extra fuel. If the engine has severe carbon deposits or the high-pressure fuel pump is aging, the fuel consumption can become painfully high. It's best to drive gently and stick to regular maintenance schedules.
Over the years of repairing cars, I've encountered many cases of diesel vehicles consuming excessive fuel. Issues with the fuel injection system are one of the main causes: clogged injectors lead to poor atomization and incomplete combustion; wear in the high-pressure fuel pump can cause excessive fuel supply, wasting fuel. Leaks in the intake and exhaust systems or a clogged particulate filter reduce engine air intake, directly lowering combustion efficiency. Another hidden issue is sensor failure, such as oxygen sensor signal drift, causing the engine control unit to miscalculate the fuel injection quantity. Poor contact in relays within the electrical system can also lead to additional power consumption and increased fuel usage. It's recommended to clean the fuel system every 20,000 kilometers and check these critical components if abnormal fuel consumption is detected.
