Zama carb on a Husky problem! need help!

[Ironhunter]

I have a Husky 353 with about 35 tanks of fuel through it. Ran like a champ as it should from day one. It now has carb issues (Zama). It will stay running by pumping the primer bulb. Disassembling the carb and cleaned the carb with a light dose of compressed air seemed to fix the problem but it reappeared after ten minutes of running. A carb kit was purchased and put in by me and again it seemed"fixed" for ten minutes. (I put in the diaphrams on both ends as well as the needle) I have also replaced the fuel line(there was nothing wrong with the old one)

I am at a loss here,,, I am a weekend warrior doing TSI work and this is my only saw

 

[Fish]

The passage under the needle must be blown out, and held up to a light,
and visually verify that it is clear.

 

[Warroad50]

Have you looked at the muffler screen? Also could be the spark plug.

 

[Ironhunter]

I have it dissassembled and I can see thru the seat/surface hole and the screen seems clear.Is that the passage way you described?

 

[Fish]

Yes, if both covers are off of the carb, and the needle removed, you need to have a clear view through that passage.
Other than that, you say you replaced the fuel lines, you have them hooked up correctly?

 

[Keen]

If it runs 10 mins and quits. You may have a fuel tank vent problem. Run it untill it starts to quit and open the gas cap a lil and see if it keeps running. If so change the vent.

 

[Ironhunter]

Fuel lines are good and are in correct position. Fuel cap/vent also has been checked, will not run right even after opening cap and letting possible air lock out. I am putting it together right now (again )and a buddy has pulled up with a trailer full of uncut lenghts of firewood.His luck day!

 

[Ironhunter]

Well,,I blew through the guy`s trailer load of wood as he sat by and watched and drained beers from my frig. I drank none,, He suggested water in the fuel as a possible culprit? so before I started we looked and poured some into a glass jar and voila,, there was some water. I thoroughly cleaned out my tank and poured some of his fuel in my saw and tried it. Seems to work great. I hope this was the problem. I did not think that water could clog the screen in the bottom of the carb,but maybe that is what it was.

In retrospect,, every time I took the carb apart and cleaned it I must have unknowingly removed the water and it would run again for a while until it collected enough to stop the screen from flowing fuel again. I learned a lot today. Again I hope that was it as the carb looked great inside and out. Thanks guys,,I am off to get some clean fuel for tomorrow.

 

[ronT2]

Thanks for the update. My 2150 was acting similar until I swapped carbs. I just took the zama C3-EL32 that came off it apart for the third time and I still can’t find anything in any of the orifices. Now after hearing about the water I’m tempted to put it back on and try it again. I could swear that I was using the same mix in all my 2-cycle stuff at the time with no problems except the saw.