Blue Line 3-Port Frame Mount Fuel Petcock Valve: GY6/QMB

Reliable Flow: Blue Line Vacuum-Operated 3-Port Fuel Valve

Restore your engine's fuel delivery system with the Blue Line 3-Port Fuel Valve. Engineered as a direct OEM replacement for GY6 139QMB and 157QMJ engines, the vacuum-actuated petcock ensures that fuel only flows when the engine is running. This critical safety feature prevents carburetor flooding and engine oil contamination, making it a vital component for the longevity of your 50cc or 150cc scooter.

Technical Performance Features

• Vacuum-Actuated Security: Automatically shuts off fuel flow when the engine stops, protecting your intake system from overflow and "hydro-locking."
• External Frame Mount: Specifically designed for scooters with frame-mounted fuel petcocks where the valve is secured via a single 6.5mm bolt hole.
• High-Flow Internal Diaphragm: Features a durable, fuel-resistant internal diaphragm that provides consistent pressure to the carburetor even under high-load conditions.
• OEM Equivalent Quality: Part of the Blue Line series, offering factory-standard fitment and performance at a fraction of the cost of boutique brand parts.

Comprehensive Fitment Guide

This 3-port valve is a universal fit for almost all Chinese-manufactured scooters with engine codes containing "QM" or "FM":

Technical Specifications

• Port Count: 3 Ports (Fuel In, Fuel Out, Vacuum)
• Mounting: 6.5mm Bolt Hole
• Material: Corrosion-Resistant Zinc Alloy
• Cross-Ref: Original Parts For Scooters SKU 164-288

Mechanic's Note: If your scooter won't start or is leaking fuel into the airbox, a failed vacuum diaphragm is often the culprit.

Installation Tip: Before installing, verify that your vacuum lines are crack-free; a vacuum leak will prevent this valve from opening.

Fitment Note: If your scooter has 4 ports, you need SKU 164-84 instead.

SKU: 1300-1156
Vendor: BLUE LINE