How To Install A Purge / Primer Bulb Properly (Don't make THIS mistake!!)

Introduction

This tutorial provides a step-by-step guide on how to properly install a purge bulb for small engine equipment. Understanding the function of the purge bulb and the correct installation process is crucial for ensuring your engine starts easily and operates efficiently.

Step 1: Understand the Purpose of the Purge Bulb

• The purge bulb is designed to remove air from the carburetor and fill it with fuel, facilitating easier engine starts.
• It is important to note that the purge bulb does not squirt fuel directly into the carburetor like a primer bulb; instead, it acts as a pump to draw fuel through the system.

Step 2: Identify the Correct Bulb Orientation

• Examine the purge bulb. It has two hose connectors:
  • The short connector is labeled "in" and connects to the carburetor.
  • The long connector is labeled "out" and connects to the fuel tank.
• Ensure that the connectors are oriented correctly to prevent installation mistakes.

Step 3: Replace the Purge Bulb

1. Remove the old bulb:
   • Disconnect the fuel lines from the old purge bulb.
   • Take out the broken or cracked bulb from its housing.
2. Install the new bulb:
   • Connect the short “in” hose to the carburetor.
   • Connect the long “out” hose to the fuel tank.
   • Ensure the connections are secure and leak-free.

Step 4: Check the Fuel Line Connections

• If you are replacing all fuel lines, verify that they are connected properly:
  • The line from the fuel filter should lead to the purge bulb's “in” connector.
  • The “out” connector should lead to the carburetor.
• If the purge bulb does not function as expected, consider swapping the lines on the carburetor to ensure proper flow.

Step 5: Test the Purge Bulb System

1. Pump the purge bulb:
   • Push the bulb in and release it to see if it draws fuel from the tank into the carburetor.
   • Observe that fuel should flow back into the fuel tank when you push the bulb.
2. Troubleshooting:
   • If the system does not work, recheck hose connections, ensuring they are not crossed.
   • If the issue persists, inspect the carburetor for any blockages or faults.

Conclusion

Proper installation of a purge bulb is essential for the optimal performance of small engine equipment. By following these steps, you can ensure that your purge system is functioning correctly, allowing for easy starts and efficient operation. If issues arise during testing, consider further examination of the carburetor or consulting additional resources for repairs.