How to Leak Test a Chainsaw Carb

The carburetor in a chainsaw regulates the flow of gas from the tank to the combustion chamber. For this process to work, the carburetor and the fuel system need to maintain a consistent amount of pressure. Any leaks of air into the system, and fuel out of the system, will cause a substantial loss in pressure and the carb will no longer properly regulate fuel flow. A pressure tester and a leak test will allow the operator to determine if a leak is present and the source of that leak.

Screwdriver
Carburetor pressure tester
Beaker
Water

Instructions

- 1
  Remove the carburetor from the chainsaw. Turn the high and low speed jets clockwise until they are fully seated. Turn the high and low speed screws one full turn counterclockwise.
- 2
  Insert the valve of the carburetor pressure tester into the fuel inlet valve on the carburetor. Make sure the tester is securely fitted to the valve.
- 3
  Submerge the carburetor into the beaker filled with water. Pump the tester’s bulb until the gauge reads 50 kPa (.5 bar) and clamp the pump tube.
- 4
  Watch the gauge and the carburetor for any leaks. Leaks will cause the water to bubble in the area of the leak and the level on the gauge to fall. Disassemble and repair leaking carburetor parts.

How to Loosen a Tight Hose on a Spigot

Can I Drill Holes in Black Vinyl Landscaping Edging?

Garden Tools & Supplies