Joe Kuhn
Hobby Repairman
I'm a hobby repairman and failed with chain saws until I gave up guessing and went to the internet to study the topic of carburetors. This drawing helped me the most with the saws I fix:
Note the sequence from :
Fuel filter inside tank to:
Carburetor inlet to:
Carburetor outlet to:
Primer bulb inlet, to:
Primer bulb outlet to:
Tank return.
If the above is not right, forget about starting your saw.
You can play with the primer bulb to figure out which connector is the inlet by pushing & releasing the bulb w one thumb while your other thumb is over one hole, then the other. When you release the bulb, take your thumb off the hole you're testing and you'll hear a slight sucking sound on the inlet but not the outlet.
Primer bulbs suck fuel through the carb, they do not push fuel through. That's the important rule to remember (I don't know of any exceptions yet). I guess it's a design feature to keep users from over pressuring carbs w fuel. The suck from the release of a bulb is consistent and cannot be overdone. Since it's a suck that moves the fuel, the sequence is always fuel filter to carburetor inlet...
How to id the inlet on a carburetor versus outlet? Look it up on the internet. Or if the fixtures are different diameters, it's the bigger one. (I'm sure there's more to this per the brand)
When the hoses are hooked up correctly, you should see the fuel and bubbles moving quickly through the hoses. If hoses are black and you cannot see the fuel, you can hear it moving when you push (squish) and there's a nice whistle when you release. If the hoses are hooked up wrong, you'll see a few bubbles move a little in one direction and maybe the other. When hooked up correctly, the fuel really moves!
Anyway, once you get the hoses right, you should be able to start it and tune the high and low screws on the carb. And that's another topic for study...
Note the sequence from :
Fuel filter inside tank to:
Carburetor inlet to:
Carburetor outlet to:
Primer bulb inlet, to:
Primer bulb outlet to:
Tank return.
If the above is not right, forget about starting your saw.
You can play with the primer bulb to figure out which connector is the inlet by pushing & releasing the bulb w one thumb while your other thumb is over one hole, then the other. When you release the bulb, take your thumb off the hole you're testing and you'll hear a slight sucking sound on the inlet but not the outlet.
Primer bulbs suck fuel through the carb, they do not push fuel through. That's the important rule to remember (I don't know of any exceptions yet). I guess it's a design feature to keep users from over pressuring carbs w fuel. The suck from the release of a bulb is consistent and cannot be overdone. Since it's a suck that moves the fuel, the sequence is always fuel filter to carburetor inlet...
How to id the inlet on a carburetor versus outlet? Look it up on the internet. Or if the fixtures are different diameters, it's the bigger one. (I'm sure there's more to this per the brand)
When the hoses are hooked up correctly, you should see the fuel and bubbles moving quickly through the hoses. If hoses are black and you cannot see the fuel, you can hear it moving when you push (squish) and there's a nice whistle when you release. If the hoses are hooked up wrong, you'll see a few bubbles move a little in one direction and maybe the other. When hooked up correctly, the fuel really moves!
Anyway, once you get the hoses right, you should be able to start it and tune the high and low screws on the carb. And that's another topic for study...