What is the primary purpose of a fuel check valve?

The primary purpose of a fuel check valve is to prevent backflow and maintain the fuel system pressure. This component is critical in ensuring that fuel flows in only one direction—toward the engine—while preventing it from flowing back into the fuel tank or other parts of the system after it has been delivered. By maintaining proper fuel pressure, the check valve helps ensure that the engine receives a consistent and adequate supply of fuel for proper operation, which is vital for engine performance and efficiency.

Other options highlight functionalities related to fuel systems, such as maximizing pressure or filtering impurities, but these do not capture the specific role of a check valve. The check valve's function is unique and integral to preventing the loss of pressure and ensuring that fuel remains in the desired path, which is essential for reliable engine performance.