Universal GY6 125/150cc Automatic Fuel Petcock: M16x1.50

GY6 150cc Automatic Fuel Valve

Ensure your engine gets the consistent fuel flow it needs with the Universal Parts Automatic Fuel Petcock. Designed for 125cc and 150cc 4-stroke GY6 (QMI/QMJ) engines, this vacuum-operated valve automatically opens to allow fuel flow when the engine is cranking or running and snaps shut when the engine stops. This essential safety feature prevents fuel from "flooding" your carburetor and crankcase during storage, protecting your engine from potential hydrolock and oil contamination.

Technical Performance Features

• Vacuum-Actuated Safety: Dual-port design utilizes engine vacuum to pull the internal diaphragm open, providing a "failsafe" shut-off when the scooter is turned off.
• Integrated Fuel Filtration: Features a high-flow 66mm nylon mesh filter screen that sits inside the tank to catch sediment and debris before it reaches your carburetor.
• Precision M16 Threading: Engineered with a standard M16x1.50 threaded nut for a secure, leak-free "bolt-on" attachment to the bottom of the fuel tank.
• 6mm Fuel Line Ready: Features an optimized outlet barb designed for a tight fit with standard 1/4" (6mm) ID fuel lines.

Comprehensive Fitment Guide

This petcock is a direct replacement for GY6 125/150cc (152QMI/157QMJ) scooters with frame-mounted fuel tanks, including:

Technical Specifications

• Thread Size: M16 x 1.50
• Nut Inner Diameter: 14.40mm
• Filter Length: 66mm
• Outlet Size: 6mm (for 1/4" Fuel Line)

Mechanic's Note: If your scooter is difficult to start after sitting or if you see fuel leaking from the airbox, your petcock diaphragm may be stuck open or ruptured. Pro Tip: When installing, always use a new 6mm Fuel Line and high-quality Fuel Line Clamps. Ensure your vacuum line is connected to the top port and the fuel line to the side port for proper operation.

SKU: 164-93
Vendor: Universal Parts