Air bubbles in fuel line.

Arborist Forum

Help Support Arborist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

MrGiggles

ArboristSite Guru
Joined
Jan 23, 2009
Messages
527
Reaction score
227
Location
Missouri
I have been working on a 1973 Crafstman 2.1 chainsaw, and just recently got it running.

It runs ok, it just needs some fine tuning. I am not sure what to think about bubbles in the fuel line. When it is idling, they move a little bit. When you rev it up, the rush to the front of the line and stay right before the metal from the carb input fitting. As far as I can tell, they don't really affect anything but I am wondering if they will or if they are harmless. It's a good old saw, made in the USA and has 2 compression rings.
 
I ran into the same problem on a similar saw and had to change the fuel filter a couple of times to clear it up.

Seemed almost like the vaccum from the carburetor pulling fuel from the tank was creating such a low pressure it was "boiling" in the line.

Mark
 
Back
Top