15474-881-000 Check Valve Spring - Overview. The 15474-881-000 Check Valve Spring is a critical component of the Honda marine engine fuel system. This spring operates within the check valve assembly, ensuring fluid or fuel flows in one direction only, preventing backflow and maintaining efficient engine function. Designed for Honda marine engines, it plays a vital role in preserving system reliability and performance, and seamlessly integrates with existing hardware and seals to maintain optimal