Gas Tank Petcock Vacuum GY6 50CC 250CC

$24.99

Replacement gas fuel pump petcock for gas tank of GY6 50CC 250CC.

5 in stock

Description

A petcock, or fuel valve, is used to control the flow of fuel from the gas tank to the carburetor in many small engines, including those found in GY6 50cc to 250cc engines. Here’s a detailed explanation of the three ports on such a petcock and their functions:

  1. Gas In (Fuel Inlet): This port connects to the fuel line coming from the gas tank. Fuel from the tank enters the petcock through this port.
  2. Vacuum Line (Vacuum Inlet): This port connects to a vacuum source, typically the intake manifold or carburetor. When the engine is running, it creates a vacuum that opens the diaphragm inside the petcock, allowing fuel to flow from the “Gas In” port to the “Gas Out” port. This helps ensure fuel only flows when the engine is running.
  3. Gas Out (Fuel Outlet): This port connects to the fuel line leading to the carburetor. When the vacuum line is activated (i.e., when the engine is running and creating a vacuum), fuel flows from the “Gas In” port, through the petcock, and out this port to the carburetor.

Installation and Use

  1. Identify the Ports: Make sure you correctly identify the ports on the petcock. They are usually marked, but if not, refer to the product’s manual or markings on the petcock.
  2. Connect the Gas In Port: Attach the fuel line from the gas tank to the “Gas In” port on the petcock.
  3. Connect the Vacuum Line: Attach the vacuum line from the intake manifold or carburetor to the “Vacuum Line” port. This line should create a vacuum when the engine is running, which is necessary to open the petcock and allow fuel to flow.
  4. Connect the Gas Out Port: Attach the fuel line from the “Gas Out” port on the petcock to the carburetor.
  5. Check for Leaks: After installation, check all connections to ensure there are no fuel leaks. Secure all hose clamps properly.

How It Works

When the engine starts and creates a vacuum in the vacuum line, this vacuum opens the diaphragm inside the petcock. This allows fuel to flow from the tank through the “Gas In” port, through the petcock, and out the “Gas Out” port to the carburetor. When the engine is turned off and no vacuum is present, the diaphragm closes, stopping the fuel flow.

Maintenance Tips

  • Regular Inspection: Periodically inspect the petcock and associated fuel lines for any signs of wear, damage, or leaks.
  • Clean the Petcock: Over time, dirt and debris can clog the petcock. If you notice reduced fuel flow, you may need to clean or replace the petcock.
  • Check Vacuum Line: Ensure the vacuum line is intact and free from cracks or leaks, as a faulty vacuum line can prevent the petcock from opening properly.

This setup ensures that fuel is delivered to the engine efficiently and only when needed, helping to prevent flooding and improve overall engine performance.

 

Additional information

Weight 0.5 lbs
Dimensions 3 × 3 × 3 in
Specifications

4-stroke Vacuum operated
Hole spacing: 76mm
Overall Height: 33.5mm

Fits Models

50cc Gy6 Engines
125cc Gy6 Engines
150cc Gy6 Engines
250cc Gy6 Engines

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