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Old 05-17-2020, 11:53 AM   #31
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Re: Stihl Trimmer Dying


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Originally Posted by kennykenny View Post
I'm assuming that the pic is showing the vent that you are referring to. The hose is attached to the back of the air filter cover. I had replaced the hose, when replacing the carburetor. I noticed the filter, when setting it in the circular housing doesn't sit fully down. Is that normal? It lifts up a bit. Thanks.
I figured out this fuel vent. I didn't realize that it was two pieces and needed to snap into the circular housing. I got the pieces put together and snapped in.

Tried starting again. Started up and ran but still died upon the release of the throttle. Good news, I was able to get restarted but the same scenario occurred. The unit died. Think the filter needs to be replaced? Something else?
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Old 05-18-2020, 04:44 PM   #32
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Re: Stihl Trimmer Dying


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Originally Posted by DexterII View Post
Okay, so now that you know what you need to do in order to see the spark, presumably you have or will start the engine, let it run until it dies, and immediately check for spark. You need to do it immediately because it won't take the coil long to cool down enough to start working again and flaw your test. Now, this said, the odds are, and my opinion is that the problem is fuel, not spark, but, since you have already changed the carburetor, it makes sense to at least check the spark. And assuming it is fuel related, I would go back and revisit what I think was my first suggestion, checking the vent because that's a sure and relatively common way to shut off the fuel flow. I would clean the cap, or, as someone else suggested, try running it with the cap loose. Also recheck that your carburetor mounting, throttle position, etc.
No new luck with the trimmer. The unit started today and ran for about five minutes and died. I never let off the throttle. Let it sit and couldn't get it to start. Sit a while longer and it tried to start and died. Ideas?
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Old 05-18-2020, 06:25 PM   #33
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Re: Stihl Trimmer Dying


Some questions:
Is the throttle wide open just to keep it running?
What position is the choke?
Have you tried running it without the fuel filter?
The throttle cable slips into the carb. When the throttle is released is the cable loose on the carb connection?
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Old 05-18-2020, 07:45 PM   #34
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Re: Stihl Trimmer Dying


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Originally Posted by djlandkpl View Post
Some questions:
Is the throttle wide open just to keep it running?
What position is the choke?
Have you tried running it without the fuel filter?
The throttle cable slips into the carb. When the throttle is released is the cable loose on the carb connection?
Yes the throttle is wide open to keep it running.
I start the choke at the top position on a cold start. Middle position on a hot start. When I squeeze the throttle, the choke moves all the way down to the bottom position.
I have not tried running it without the fuel filter. I replaced the fuel filter a week or so ago. Should I try removing the filter and try?

As far as the loose carb connection, can you please give further clarification? Are referring to the end of the throttle cable connection that fits into the carburetor circular mechanism? If so, I'm not sure what you mean by loose. Loose cable? It fits in the mechanism.

Thank you.
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Old 05-18-2020, 09:14 PM   #35
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Re: Stihl Trimmer Dying


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Originally Posted by kennykenny View Post
Yes the throttle is wide open to keep it running.
I start the choke at the top position on a cold start. Middle position on a hot start. When I squeeze the throttle, the choke moves all the way down to the bottom position.
I have not tried running it without the fuel filter. I replaced the fuel filter a week or so ago. Should I try removing the filter and try?

As far as the loose carb connection, can you please give further clarification? Are referring to the end of the throttle cable connection that fits into the carburetor circular mechanism? If so, I'm not sure what you mean by loose. Loose cable? It fits in the mechanism.

Thank you.

Try it without the filter. I had a blower that would only idle. Without the filter it ran great. Iím suggesting it to rule it out.

For the carb connection, the throttle cable hooks into it. When the throttle is released the cable should have no tension on the circular piece...not pulling or pushing it.
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Old 05-19-2020, 04:04 PM   #36
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Re: Stihl Trimmer Dying


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Originally Posted by djlandkpl View Post
Try it without the filter. I had a blower that would only idle. Without the filter it ran great. Iím suggesting it to rule it out.

For the carb connection, the throttle cable hooks into it. When the throttle is released the cable should have no tension on the circular piece...not pulling or pushing it.

I started up the unit today after sitting overnight. Ran for about 5-10 minutes and then died during use even with the throttle pressed. it fades out much like a unit would do when something runs out of gas, without the sputtering. I removed the fuel filter and amazingly it started back up. Ran for less than 5 minutes and died and wouldn't start again.

No tension on the throttle cable.
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Old 05-19-2020, 05:00 PM   #37
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Re: Stihl Trimmer Dying


Suggest you check spark arrestor
https://www.youtube.com/watch?time_c...ture=emb_title
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Old 05-19-2020, 05:03 PM   #38
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Re: Stihl Trimmer Dying


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It is an acquired unit. It didn't have and still does not have a spark arrestor.
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Old 05-19-2020, 07:15 PM   #39
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Re: Stihl Trimmer Dying


As Dexter suggested did you check for spark once it dies? I'm thinking the timing is off but just a guess.
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Old 05-19-2020, 08:42 PM   #40
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Re: Stihl Trimmer Dying


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Originally Posted by djlandkpl View Post
As Dexter suggested did you check for spark once it dies? I'm thinking the timing is off but just a guess.
I did check for spark after it died and it did have a spark. The way that it dies while in use, it almost seems like it is a fuel issue but I am not sure what else to check.
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Old 05-20-2020, 09:20 AM   #41
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Re: Stihl Trimmer Dying


I'm out of ideas except. Try running it with no fuel filter, loose gas cap and no air filter. It does sound like a fuel issue since you have to have the throttle on to keep it running.
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Old 05-20-2020, 09:31 PM   #42
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Re: Stihl Trimmer Dying


There is a point in every repair when a person reaches the limit of their capabilities. It looks like you have tried everything with no success.
Bring it to a repair shop if you want to keep the unit or sell it as it.
Somethings just can't be fixed with new hoses, carburetor, filter etc.
It does sound like a carburetor adjustment but since you changed the carburetor that is unlikely. Any chance you have bad fuel? I didn't see that addressed in this thread so maybe it is a factor.
With the new carburetor it should run well. Since it doesn't perhaps it is a fuel quality issue. Too much oil in the gas or just gas that has just lost it's potential.
Have you tried fresh fuel mixed properly for that machine?
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