Question about Craftsman 25cc Gas Line Trimmer

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Craftsman Weed eater, older won't stay running

The thing would not start, then removed and cleaned the carb. When putting it back together had to replace the primer button. THe original primer had two size line unsed and when I bought a replacement (That I could not find at sears) the primer function was reversed. Forced the lines on to work and actually had it running. Used it the other day and then ran it today for about 15 minutes
This evening I went to use it and it would start but not stay running. I would prime it, it would start then quit. This ran great this morning but not this afternoon it started acting up.

I have another smaller one that stopped running a couple of years a go. I also decided to work on this one over the past week. I took the carb completely a part because it would start after ptiming and then quit. after removing everything including the needle and putting it back together it leaks like a crazy. The needle application did not seem to move at all when I tightened the screw. In fact it seems that it has no function at all. Besides cleaning the inside and using gaskets that I bought some time back, I used a welding tip cleaner to try and clean te jet and openings. At first it ran when I primed it then quit, then after opening it all up and cleaning it now it just leaks.

Any answers besides buying new carbs?

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The symptoms you reported are commonly resolved when the following is checked, then cleaned or replaced:

  • fuel filter - located inside the gas tank
  • Spark plug
  • Spark Arrestor - at muffler. When clogged with carbon build up, the exhaust flow is extremely restricted, and causes problems
  • Carburetor - may need a new rebuild kit
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Posted on May 19, 2015

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When cleaning the carb., this is key:

Use a Den Tek Brush, (,to clean the small portals in carb. These portals can become blocked. Reassemble and start.

If you need further assistance, just let me know.


Posted on Jun 28, 2009

  • Jim Parker
    Jim Parker Jul 01, 2009

    Did this solution solve the problem?




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1 Answer

When I pump the primer bulb, why doesn't it fill with fuel and stays collapsed?

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Weedeater PE550 will not stay on. Prior to placing this unit in long-term storage, the unit worked. Since pulling it out for this season, it would not start. I replaced the fuel lines and primer bulb. ...

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There are three things that you need for it to work.

Fuel, air and spark.

If you are missing any one of those things, or if one isn't optimal, it wont work well if at all.

You say spraying carb cleaner into the chamber lets it start, but after a minute it dies?

That tells me you are getting a spark.

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Often when fuel sits around inside a carburetor it can build up gunk and make it not function properly. I recommend removing the carburetor and taking it completely apart, cleaning everything with carb cleaner and putting it back together. It sounds difficult, but I promise it is not, just take pictures to help you remember how everything goes together if you want.

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I’m happy to assist further over the phone at

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Primer bulb on weedeater won't prime

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