What component directly supplies fuel to the engine?

The fuel feed chamber is a crucial component in the fuel supply system of an engine, as it works to ensure that fuel is adequately prepared and delivered to the engine for combustion. Typically, the fuel feed chamber holds fuel and maintains a steady flow to the engine, preventing interruptions that could impact performance. This component is designed to ensure that the fuel being sent to the engine is free from debris and contamination, playing a vital role in engine efficiency and reliability.

In contrast, while the fuel return line carries excess fuel back to the tank, and the fuel filter removes impurities from the fuel, these components do not directly supply the fuel to the engine. The boost pump, on the other hand, helps to increase fuel pressure but does not store or prepare fuel for direct delivery to the engine. Therefore, the fuel feed chamber is the component specifically responsible for the direct supply of fuel to the engine, making it the correct answer.