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