Vacuum-operated fuel petcock showing M14x1.00 gold hex nut thread fitting, 5mm fuel outlet barb, vacuum port nipple, and clear 62mm filter tube Vacuum-operated fuel petcock showing M14x1.00 gold hex nut thread fitting, 5mm fuel outlet barb, vacuum port nipple, and clear 62mm filter tube
Vacuum-operated fuel petcock showing M14x1.00 gold hex nut thread fitting, 5mm fuel outlet barb, vacuum port nipple, and clear 62mm filter tube

Blue Line

Blue Line Vacuum Fuel Petcock M14x1.00 - GY6, 139QMB

SKU 1100-1417
$9.00
Shipping calculated at checkout.
Description

Restore reliable fuel flow with this vacuum-operated replacement fuel petcock. Designed for scooters with gas tanks mounted high in the tail section, this petcock uses engine vacuum to open the fuel valve automatically when the engine is running — and closes it when the engine stops, preventing fuel from flooding the carburetor. Fits the M14x1.00 coarse-thread tank fitting used across CSC models and the broad GY6 / QMB139 Chinese scooter platform.

Key Features

  • Vacuum-Operated (Automatic): Opens with engine vacuum, closes at rest — no manual ON/OFF/RES lever required.
  • M14x1.00 Thread: Correct coarse-thread fitting for high-mounted tail-section fuel tanks on GY6 and QMB139 platforms.
  • 5mm Fuel Outlet Barb: Standard barb size for OEM fuel line connections on listed scooters.
  • Integrated Filter Tube: Clear 62mm filter tube screens debris before it reaches the carb.

Compatible Models

  • CSC go. and go. MAX
  • CSC Bella Classic 50
  • CSC Nitro Sport 50
  • CSC Pug 50
  • GY6 125cc / 150cc scooters (157QMJ-based) with vacuum petcock
  • QMB139 / 139QMB 50cc scooters with vacuum petcock

Technical Specifications

  • Thread Size: M14 x 1.00 (coarse)
  • Nut Inner Diameter: 13mm
  • Fuel Outlet Diameter: 5mm
  • Filter Tube Length: 62mm
  • Operation: Vacuum-operated automatic petcock
  • Manufacturer: Prima / OEM | SKU: 129-25 / 164-93

Important: Compare your existing petcock to the image before ordering — once fuel has passed through this part, it is non-returnable. This petcock does not fit Genuine Scooter Company models, which use a different thread pitch.
Product Diagrams
Features
  • Vacuum-Operated Automatic Petcock
  • M14x1.00 Coarse Thread Tank Fitting
  • 5mm Fuel Outlet Barb
  • 62mm Integrated Clear Filter Tube
  • Fits CSC go. go. MAX Bella Classic Nitro Sport Pug
  • Fits GY6 125/150cc and QMB139 50cc Scooter Platforms
Specifications

Thread: M14x1.00 coarse | Nut ID: 13mm | Fuel outlet: 5mm | Filter length: 62mm | Operation: Vacuum-operated | SKU: 129-25 / 164-93
Model Fitments

CSC go., go. MAX, Bella Classic 50, Nitro Sport 50, Pug 50; GY6 125/150cc (157QMJ) and QMB139 50cc Chinese scooters with vacuum-operated petcock and M14x1.00 tank thread
  • Same day shipping for orders placed before 2PM (CST) M-F
  • 30-day return period on eligible items
  • Flat-rate shipping for orders shipped to the 48 Contiguous United States.
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