16740-ZZ5-003 Pressure Regulator - Overview. The 16740-ZZ5-003 Pressure Regulator is a crucial component in Honda marine engine fuel systems. It maintains the correct fuel pressure, ensuring optimal fuel delivery and engine performance. Designed specifically for Honda marine engines, it plays a vital role in keeping your engine running smoothly and reliably. Engineered to match factory specifications and tolerances, this pressure regulator guarantees seamless integration with existing parts, mai