Trimmer Carb Questions - Woodworking Talk - Woodworkers Forum
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post #1 of 5 Old 08-08-2015, 05:31 PM Thread Starter
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Trimmer Carb Questions

So I took apart the carb and cleaned it today on my Stihl FS80 via a very informative video I found on YouTube. As far as I can tell everything came apart and went back together as it should.

Problem is now I can't get it to run. Initially it fire after the 3rd pull and ran for about 5-6 seconds then died. The primer bulb doesn't appear to be getting fuel to it. Primer bulb is brand new BTW. It's hard to push down and quick to come back up, which leads me to think it's not sucking up fuel like it should. And I don't see any fuel in the bulb.

Any ideas are much appreciated.

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post #2 of 5 Old 08-08-2015, 05:42 PM
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You suddenly became a small engine mechanic by watching a UTube video. That is where your problems began.

The carburetor is the most complex part of that engine. Getting it tuned correctly is not for those without experience.

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post #3 of 5 Old 08-08-2015, 05:55 PM
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probably ....

It's not creating suction because of a line leak OR a blockage. Remove the line at the tank end and porss the bulb to see if there is suction. Did you drain all the fuel from the tank and is it free from crud?
Is the bowl on the carb filling? Those are some easy things to check. Unless you removed the jets or introduced crud, the carb itself should be fine. All the screw settings for fast and slow idle should be back to roughly where you started, usually screwed fully in, then back out 2 turns or so...

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #4 of 5 Old 08-08-2015, 08:03 PM
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It's not uncommon for the fuel lines to deteriorate before you ever have carb problems. They can be a pain to replace but worth the time taken.
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post #5 of 5 Old 08-09-2015, 03:30 AM
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Quick test, pop the line off the 'output' side of the bulb and press the bulb a few times. If it squirts fuel everywhere, the intake from the tank is fine. If that checks out, reconnect the hose to the output side of the buld and disconnect the other end of the hose from whatever its connected to, most likely the carb. Work the bulb again. If fuel still squirts, you've got an issue with the carb. If no fuel, fuel lines need replacing

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