燃料・吸気
The fuel and air intake system delivers diesel fuel and clean air to the engine in the right amounts for combustion. This category covers the parts that supply, filter, and meter fuel and air, such as fuel lines and injectors on the fuel side and the intake ducting and air supply on the air side.
The fuel side draws diesel from the tank, filters it, and delivers it under pressure to the injectors, which spray a fine mist into the cylinders. The air side draws in air, filters it, and routes it to the cylinders, often boosted by a turbocharger. A diesel engine runs with more air than fuel, so a steady supply of clean, well-metered air and fuel is essential for complete combustion and full power.
Filters clog, injectors and seals wear, and intake parts can crack or leak. Signs include power loss, poor fuel economy, rough running, hard starting, and black smoke when the air supply cannot keep up with the fuel. Because dirty fuel or air accelerates wear, filters are changed on schedule and the system kept sealed and clean, with symptoms diagnosed by a technician.
The correct part depends on the engine model and the fuel and intake system design. Confirm the part against the vehicle and engine specification before fitting.
Frequently asked questions
What does the fuel and air intake system do?
It supplies clean, properly metered diesel fuel and air to the cylinders so the engine can burn fuel completely and produce full power.
Why does my truck blow black smoke?
Often the air supply is not keeping up with the fuel, leaving unburned fuel as soot. It can also come from a fuel injector fault or carbon buildup, and should be diagnosed.
Why are clean filters important here?
Dirty fuel or air filters restrict flow and let contaminants reach the engine, reducing power and economy and accelerating wear, so they are changed on schedule.
How do I choose the right part?
Match it to the engine model and the fuel and intake system design, and confirm against the vehicle and engine specification before fitting.