Yamaha - Fuel Pressure Regulator Fuel System Component 6C5-13906-01-00. Overview. Fuel pressure problems can be frustrating because the symptoms don't always point straight to the cause. This regulator is what keeps fuel pressure steady so the engine runs clean and consistent across the whole range. When it starts to drift, you'll notice hesitation, rough idle, or uneven power under load. Getting it sorted out brings the engine back to that smooth, reliable feel you expect.. Key Features. • Stable Fuel Pressure Control - Maintains consistent pressure for smooth engine operation.. • Improved Engine Consistency - Helps eliminate hesitation and uneven throttle response.. • OEM Fit Accuracy - Matches Yamaha factory specs for proper calibration and installation.. • Fuel System Durability - Built to handle constant fuel flow and marine conditions.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha outboard model and part number before installation.. FAQs. Q1: What a