Question about Craftsman 25cc Gas Line Trimmer
Was working fine and then stopped. It will start and run for a few seconds and then stop. I cut the end of the small fuel line at the tank and then reinserted it. The primer bulb doesn't feel right. Isn't pumping gas like it used to, doesn't fill with gas, and sometimes won't pop back up after being pressed. I've replace the plug although the old one looked fine. Model is 358.794240
When the Craftsman Weedwacker starts in idle and then stalls and the primer bulb will not fill with gasoline or will not pop back after being pushed in, then you have a blockage within the carburetor. The bulb is intended to **** fuel into the supply line, to prime it. To solve the problem, remove the carburetor, open the side that has ONE screw holding it (not the side with four small screws), remove all the two lines remembering how they were attached (the feeder line from the fuel tank attaches to the straight copper tube and the tube going to the bulb intake side attaches to the bent copper tube) and blow out the material blocking the fuel flow inside the carburetor. Then after replacing the carburetor, press the bulb and it should **** and discharge fuel easly. I have had two of these and the fuel path within the carburetor clogs easly. Jim Hart
Posted on Jun 05, 2009
Craftsman weed eaters are well know for there fuel line to dry rot.the filter falls off and the carb fills up with the fuel line.there is a small filter inside the carb that needs to be cleaned out.replace the fuel lines and take the the carb apart and carefully blow the filter out.don't loose the screen that's inside the carb.very easy to do.once it's clean reinstall the carb and it should prime just like it's use to.make sure the filter is back on inside the fuel tank....let me know if this helped you
Posted on Mar 13, 2009
I have a similar problem..
I can get it started with no problem. however once the throttle is applied it sounds like it is choking.. as if it is to much of something. I am wondering if the secondary circuit is at fault here. i dont have the tool to turn the jets so I am stuck. (when I get em out I am grinding a **** into the tops so I can turn with regular SD.
Upon spraying some carb cleaner or starter fluid at the throttle shaft (top) it seems that it causes the carb to stumble i am wondering if it is allowing air in there and messing up the mixture.
I ran it for probably 2 hours cycling the throttle and injecting Seafoam into it with fresh gas (and seaFoam in that) it cleared up the idle but once out of 50 times I can get it to start reving up a tad. otherwise its stuck at close to idle.
I cleaned the carb all except the jets (I cant get em out).
I will have to check the Cyl head also and see if perhaps its loose.
Posted on Jun 28, 2010
Loose head. I have found that the head on the Craftsman weedwackers have a tendency to loosen that will allow it to start for a moment then stop. It sucks air. The last 2 that I have bought I have to tighten the head after every 8 to 10 hours of use.
I've had the same problem with my Craftsman blower.
Posted on May 11, 2010
I just replaced the fuel lines from the tank to the carb, I got universal lines from lowes and had to drill one of the holes in the tank slightly bigger. Careful! make sure the diameter of the new hole is slightly smaller than the new fuel line so it wont leak. Works like a charm.
Posted on Jul 26, 2010
Small blockage on the carb will cause this. I've had sand in the carb and its not easy to get out sometimes. The motor will start then die.
Posted on Jul 13, 2020
If the primer bulb won't pop out, the chances are that the check valve in the bulb may be gummed up and sticking, preventing gas from flowing into the bulb. This can happen if fuel is left in the trimmer over winter.
Check out this guide I've written which covers typical problems which prevent trimmers from starting and running. It also shows you how a carburetor works and how to disassemble it and clean it
String Trimmer Won Work 2 Stroke Engine and Carburetor Troubleshooting
Posted on Mar 19, 2015
I've also discovered that one of the reason trimmers will not "rev up" is because of blockage in the "muffler" is clogged with shuet caused by incorrect fuel mixture. Mostly to much oil.
Posted on Jan 15, 2015
The gas take up line is disconnected or is broken. I have the same problem and need to find a diagram to fux it.
Posted on Aug 28, 2009
MORE THAN LIKELY YOU HAVE BEEN USEING ETHANOL FUEL NEED A METANOLE FUELCLEANER AT MOST AUTO PARTS SUPLYER THEY SELL A FUEL CLEANER FOR SMALL ENG. IF NOT THAT MAKE SURE FUEL LINE IS NOT CRACKED
Posted on Nov 15, 2011
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