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Weedwhacker keeps stalling #5420247 05/03/20 08:10 PM
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Oldtom Offline OP
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Good Evening. I have a Craftsman weedwhacker model number 358791072. I have always run stabilized E0 gas and synthetic 2 cycle oil and never had a problem. Now, the engine will only run with the choke on. Opening the throttle kicks the choke off and it struggles to gain RPM and then stalls.

I put a generous amount of fuel system cleaner in the tank one week ago. I ran the trimmer for five minutes and then put it away. Usually, this fuel system soak solves a lot of problems. Not this time.

I can buy a carb, fuel lines, and tank filter for about 50 bucks. Before firing the parts cannon, is there anything I can check now? Thanks in advance for any advice.

Re: Weedwhacker keeps stalling [Re: Oldtom] #5420267 05/03/20 08:28 PM
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Is the ‘spark arrestor’ clean or removed?

Re: Weedwhacker keeps stalling [Re: Oldtom] #5420273 05/03/20 08:33 PM
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JohnnyJohnson Offline
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Did you purge it completely of gas last fall? Use the fuel system cleaner again with premium fuel.


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In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 77077
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: Weedwhacker keeps stalling [Re: Oldtom] #5420405 05/04/20 12:00 AM
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Poke the jet with a wire.


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Re: Weedwhacker keeps stalling [Re: Oldtom] #5420413 05/04/20 12:19 AM
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ripcord Offline
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Check the fuel lines and the purge valve for breaks.

Re: Weedwhacker keeps stalling [Re: Mr_Joe] #5420429 05/04/20 01:39 AM
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Linctex Offline
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Originally Posted by Mr_Joe
Is the ‘spark arrestor’ clean or removed?


Yes, check this screen in the exhaust for carbon buildup!


"The evidence demands a verdict".
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Re: Weedwhacker keeps stalling [Re: Oldtom] #5420448 05/04/20 02:31 AM
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FT92 Offline
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check muffler/spark arrester they can get clogged with carbon deposits take apart and clean if that's the case..i have had a few like that over the years

Re: Weedwhacker keeps stalling [Re: Oldtom] #5420466 05/04/20 04:05 AM
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Lubener Offline
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Originally Posted by Oldtom
Good Evening. I have a Craftsman weedwhacker model number 358791072. I have always run stabilized E0 gas and synthetic 2 cycle oil and never had a problem. Now, the engine will only run with the choke on. Opening the throttle kicks the choke off and it struggles to gain RPM and then stalls.

I put a generous amount of fuel system cleaner in the tank one week ago. I ran the trimmer for five minutes and then put it away. Usually, this fuel system soak solves a lot of problems. Not this time.

I can buy a carb, fuel lines, and tank filter for about 50 bucks. Before firing the parts cannon, is there anything I can check now? Thanks in advance for any advice.

It is carb related. You are running too lean and have to choke it to keep it running. The pumping diaphram likely stiffened up due to age and won't pull in enough fuel.It's not a plugged exhaust since that would cause issues all the time and wouldn't run properly even by choking.That Craftsman trimmer would have to be in real good condition before I would put $50 into it. You should be able to find a better price online and I wouldn't buy it from Sears, they are way too expensive.

Last edited by Lubener; 05/04/20 04:10 AM.

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Re: Weedwhacker keeps stalling [Re: Oldtom] #5420514 05/04/20 06:44 AM
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skyactiv Offline
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With those cheap trimmers, one thing breaks and midway through the summer, something else breaks, too. They have carbs cheap on eBay, but your blowing time fixing a POS Poulan basically.
An idea for those of you that have power tools is to see if the battery is compatible with a trimmer they offer. This Dewalt as an example: https://www.amazon.com/DEWALT-DCST920B-Lithium-Ion-Brushless-Trimmer/dp/B01C5YWS3A?ref_=ast_sto_dp


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Re: Weedwhacker keeps stalling [Re: Oldtom] #5420538 05/04/20 07:23 AM
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Option 1. Seafoam the engine (50/50 soak with seafoam) which solved the problem about 50% of the time for about $8.

Option 2. If you go to Sears parts site you will find this model takes carburetor #545006017. Google this number brings up knock off carbs on eBay for <$12 shipped. Easy to replace and will solve the fuel problem 99% of the time.

I would choose option 2.


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2012 Honda Odyssey EX-L >108k miles; QSUD 0W20 + STP S6607XL
Re: Weedwhacker keeps stalling [Re: skyactiv] #5420587 05/04/20 08:55 AM
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Originally Posted by skyactiv
With those cheap trimmers, one thing breaks and midway through the summer, something else breaks, too. They have carbs cheap on eBay, but your blowing time fixing a POS Poulan basically.
An idea for those of you that have power tools is to see if the battery is compatible with a trimmer they offer. This Dewalt as an example: https://www.amazon.com/DEWALT-DCST920B-Lithium-Ion-Brushless-Trimmer/dp/B01C5YWS3A?ref_=ast_sto_dp



So instead of him fixing it for $50 and being fine for a few more years you recommend he spend at least $125 on a new one? Seems kind of silly if the current one is repairable.

I fix a ton of weed trimmers for customers. Usually I can throw on an ebay carb (I don't even bother with rebuilds) and they are good for a few more years AT LEAST. If it breaks halfway through the season after a new carb they are operating it wrong.


1998 Jeep Wrangler Sahara 4.0L/5MT (157k) - PHM 10w30, Wix 51085
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Re: Weedwhacker keeps stalling [Re: Oldtom] #5420595 05/04/20 09:04 AM
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Remove the carb from the engine then take off the metering diaphragm (usually 4 small screws on the side opposite the fuel inlet). If the rubber has become hard and "crispy" over time it will never be able to hold the proper mixture and it needs to be replaced (or replace entire carb). On the other side is the fuel pump, which is also diaphragm operated. But newer carbs will have a plastic or silicone fuel pump diaphragm that doesn't harden with age. A new diaphragm is only a couple of bucks and it is the one part that really needs replacing to "rebuild" the carb. Before putting the metering diaphragm back on shoot some carb spray cleaner through the small fuel passage holes in the area under the diaphragm. It should come out in the carbuerator throat.

Last edited by mk378; 05/04/20 09:05 AM.
Re: Weedwhacker keeps stalling [Re: Oldtom] #5420608 05/04/20 09:22 AM
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As others have stated already I have fixed similar issues on several two strokes by replacing the diaphram on the carb. It may be more cost and time effective to just put a cheap carb on it from Amazon though.

Re: Weedwhacker keeps stalling [Re: Oldtom] #5420669 05/04/20 10:39 AM
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Check the fuel Filter. My Stihl would start but not run at full throttle, I replaced the filter and it ran like new.


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Re: Weedwhacker keeps stalling [Re: Oldtom] #5420721 05/04/20 11:46 AM
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I bought a cheapie carb on amazon for like $20. Also get the fuel lines and filter in kit too ...Ive had fuel lines inside the tank dissolve so replace em. Closing the choke butterfly creates more vacuum helping pull in fuel ...issue sounds like diaphragm pump to me also.

Last edited by Kawiguy454; 05/04/20 11:47 AM.
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