Question about Poulan 25cc 2-Cycle Gas Powered String Trimmer #P2500

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Try swapping the hoses at the primer bulb. You may have put the return hose on the purge side of the primer bulb.

Posted on Oct 16, 2010

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Trimmer won't prime to start

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.

Aug 13, 2016 | Garden

1 Answer

Primer bulb will not prime

Hello Tony Galvan, I had to replace the fuel lines to keep from sucking air when I pressed on the primer bulb. Also, I took the carburetor apart and found the gasket was good by holding it up to the sunlight, no light came through indicating holes in the gasket. Then I took a magnifying glass and looked at the bottom half of the carburetor and noticed that a soft film of what looks like lint from a dryer had accumulated on a screen mesh type of filter. Once I cleaned the debris away, the weed wacker started every time. I pulled with a full choke and partially wants to start. Then moved the choke to half choke and pressed on the throttle fully and pulled, it started! But you must at least hold the throttle close to full until 10 seconds for the engine to warm up. Then move the choke to idle. Hope this helps.

May 29, 2013 | Weed Eater SST25CE Gas Trimmer

1 Answer

Primer bulb

Hi Bob McDonnell....
Here is how your fuel should be routed...
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Sep 26, 2012 | Garden

1 Answer

I have a 1995 homelite plt-3400 gas trimmer. It starts ok. It runs fine at full throttle, but will not idle. I have replaced the primer bulb because it had a crack and it has a new spark plug. I have also...

You may be able to adjust the carburetor as I describe below but if it doesn't work then I would recommend you clean the carburetor and install a carburetor kit. When you have it back together then you will need to able to adjust the two mixture adjustment screws. When you have it started you goal is to adjust the idle screw so it not only idles but when you pull on the speed control it does not falter you try to accelerate it. The other screw affects the mixture at higher speed. When you can accelerate it from idle to full speed and back again repeatedly without faltering etc. then it is fairly good. If you turn both of these screws counter clockwise a little more it should reduce the risk that you may be too lean. It still needs to run well. I hope this helps and if you have any other questions feel free to contact me.

Aug 14, 2011 | Garden

2 Answers

Won't start , can not get primer to work even after replacing primer bulb.

If your fuel filter is clean, and none of the fuel lines are pinched, then you probably need to replace the diaphragms, gaskets, and screen in the carb. Some carbs with the primer bulbs mounted on the carb have a check valve in the primer system. This is the least likely problem, but it is possible that the check valve is defective.

May 07, 2011 | Ryobi 30cc 17" String Trimmer Zrry30530...

1 Answer

Hard starting 4 cycle trimmer, 20 to 70 pulls

I got me one of these beasts and I can get her to fire for me in just 3 pulls.
(Oh yeah?! I can name that tune in just 2 notes!!)


Use that primer bulb. Use it with prejudice. Do NOT be afraid of it. What does this mean? Yes. Push it 10 times.

Choke full on.

Full throttle, choke fully on, give it a tug. You should see it hit and give a whitish puff of smoke.

Half choke - Position 2 - Full throttle, another tug. Should fire and rev with you still squeezing that throttle at full. Release throttle and LET IT IDLE at half choke for 30 seconds.

Move the choke completely off, continue to let trimmer idle for at least a minute to warm up the oil and block.

Git to whackin' that yard down. :D I just love my 575ES! (Polesaw attachment for the win)

May 07, 2010 | Troy Bilt Tb425cs 26cc 4 - Cycle Curved -...

1 Answer

Trimmer will not stay running without the choke on. It will still run but not well and it will not let you throttle up. Is it an adjustment on the carb? The other problem is I dont have the owners manual...

You have fuel flow problem obviously. One of the screws is idle adjustment, easily identified by SLOWLY turning it in or out for change in rpm, the other is your high speed jet, turning it in or out while trigger is at full throttle to get max rpm and instant response from idle. Something else to check might be for an air leak in the fuel line, loose connection etc. Check the primer bulb area very well including the bulb itself. Hope this helps.

Apr 26, 2010 | Craftsman 25cc Gas Line Trimmer

2 Answers

Engine won't run unless primer bulb is being pumped

I have the same problem and may have a solution. I looked at the primer pump and it was cracked letting air into the system. When I pumped it my finger was over the crack and it worked fine. When I stopped the crack was able to **** air again. Take a look.

Jun 20, 2009 | Boating

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