👉 Residual fluid (R-fluid) is a term used in the context of fuel injection systems, particularly in internal combustion engines, to describe any unburned fuel that remains in the engine's cylinders after the primary combustion cycle. This leftover fuel can originate from incomplete combustion, leaks in the fuel system, or improper fuel injection. Managing residual fluid is crucial because it not only reduces engine efficiency but can also lead to increased emissions and potential damage over time. Modern engines are equipped with various systems, such as fuel injectors and fuel filters, to minimize R-fluid accumulation and ensure optimal performance.
