- In diesel fuel injection systems, fuel is shot directly into each cylinder of the vehicle's diesel engine. For this reason diesel injectors were built to perform under extremely high temperatures. Diesel injectors also can perform at pressures much too great for gasoline injectors to handle.
- Diesel fuel injection performance can suffer due to the fact that diesel fuel is known for clogging injectors. It also doesn't help that diesel fuel lacks the lubrication necessary to flow freely through the injectors. Some type of additive is often needed to assist with lubrication in diesel fuel injection systems.
- To make sure that a diesel injection system is performing properly, a digital pyrometer can be used to reveal the temperatures of the cylinders in the diesel engine. Cylinders with lower readings indicate issues with fuel delivery performance.