Question about Craftsman 25cc Gas Line Trimmer

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Starts and runs for 30 seconds and quits. I think it runs on the fuel from the primer. Fuel filter?

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Posted on Jan 02, 2017

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SOURCE: Craftsman Weedeater won't start

You are definitely on the right track. There is only one thing that could be wrong as long as you replaced the needle valve, screen, gasket, & diaphragm. When cleaning the carb., you need to clean the small portals incarb. with a Den Tek Brush, (used for cleaning between teeth), they work great for this job. These portals, if blocked slightly, can cause this problem.


Posted on Jun 02, 2009

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SOURCE: Craftsman trimmer won't start

Let's start with the easy stuff first. Remove and clean the spark plug. Look into the tank and fish out the fuel filter. It should be stuck in the end of the fuel line in the tank. I usually use a short piece of coathanger with a small hook bent into the end of it. Clean or replace the fuel filter. The next thing is to clean the small screen at the exhaust. Remove any carbon build-up there that you can. Sure hope this helped and best wishes.

Posted on Aug 17, 2009

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SOURCE: Fuel line goes into tank bottom line has filter

Fuel Line Replacement by

  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer bulb, an output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
  • The pressure side of the primer returns displaced fuel to the tank as it is depressed.
Take lots of notes and a few digital photographs to help with reassembly.
The line with the filter needs to be long enough to reach all parts of the tank as the saw is moved, a little to long is probably better than to short. The line returning from the primer is not critical so long as it cannot fall out (mid tank). All the primer line does is return excess fuel to the tank. Does this answer your question?

Posted on Dec 08, 2009

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SOURCE: not getting fuel replaced primer and hoses and not

It's easy to mess this up as I've done it in the past. If the unit has an external purge bulb, the fuel line from the fuel tank that has the fuel filter on it goes directly to the carburetor...near the part of the carb that holds the fuel pump and has the grooved cover (where an inbuilt purge bulb would be). The other line coming out of the fuel tank goes to the purge bulb. The side of the carburetor that has the diaphragm and metering lever cover has the line going to the purge bulb. Remember, this is not really a primer...the purge bulb pulls air and old fuel out of the carb and when it does this, fresh fuel flows into it...and then the bulb pushes that air and old fuel back into the fuel tank. Hope this helps.

Posted on Jun 16, 2010

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SOURCE: Craftsman weed trimmer primer bulb is working in reverse

Make sure the line is near the botto ofthe tank.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

Posted on Jul 20, 2010

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Look inside the tank. Some units have a stone inside that blocks the fuel line when it is tipped a certain way. Might be what's happening here.

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Walbro WT891 carb on a Craftsman chainsaw. Carb is brand new, all fuel lines and fule filter replaced. I prime the carb with the little plunger, chainsaw starts up and runs out of fuel within 30 seconds....

Who connected these hoses? the normal routing for a machine with a primer is like this, the fuel hose from the tank with the filter on the end goes to the carb fuel inlet nozzel ( not to the primer ) nearest to the pump cover ( cover on carb held with one screw ) the pipe from the metering side of the carb connects to the shorter nozzel on the primer bulb ( suction side ), the longer nozzel on the primer ( pressure side ) connects to the pipe going back to the tank, just remember the primer pulls fuel from the carb,into the bulb, and pushes it back into the tank, it is not actually a primer it is a purge. because it is connected this way it is impossible to flood the engine no matter how many times the bulb is pressed.
Let me know if it starts and runs.

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I have a poulanpro 260 chainsaw when i went to use it ofter 6 months,it would not start.had old stail gas. i change the gas,cleaned the air filter,check and cleaned the spark plug,still not starting. one...

Check the fuel filter, and muffler for plugging. Check the condition of all of the fuel lines. Fix or replace the primer pump. When you get it working right, push the primer quite a number of times to flush all of the old fuel out of the carburetor. Unless the carburetor is in trouble, you should be able to start the engine again. Hope this helps!

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I have a 345 e Series 18" (I think it's 18). It's a couple of years old and probably no more than 3-5 total hours usage. Normally starts and runs perfect. Today it won't run, seems to be starving for gas....

If stale fuel has been left in the saw then try draining the tank and re filling with fresh fuel, also hook the fuel line out of the fuel tank and replace the filter on the end.

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My saw runs for 10 secs then stops, out of fuel. It will run for 30 secs on the choke, but stops. Primer bulb is dry when it quits. It is a Mac 225-16 - anyone know where the fuel filter is?

On the bottom of a hose in the fuel tank. Did you replace or disconnect the fuel lines? I think improperly plumbed. It should be similar to this.

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH

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My homelite tiller stalls after 30-60 seconds of running. i changed plug and checked filter. gas is new

I'm assuming a 2-stroke engine. Does the fuel system have a primer button? Assuming that the answer is yes, the carburetor is not pumping fuel, but starting on the primer charge. Is the carburetor a Walbro brand? If so, got to: for a 12 page PDF on theory and repair of these carburetors. If the primer works, the main fuel line should be ok.

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2 Answers

Fails to stay running / primer bulb does not fill

Double check that the fuel lines are routed properly. Another place to look for a potential problem is where the fuel line comes out of the tank. Make sure the hose is not pinched. The typical fuel line routing is the first line (the one with the fuel filter in the end of it) comes out of the tank and goes to the bottom fitting on the carburator. The second line comes out of the tank and goes to the bottom fitting on the primer bulb and the third line goes from top fitting on primer bulb to top fitting on carburator. Hope this helped and best wishes.

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