Question about Poulan 25cc 2-Cycle Gas Powered String Trimmer with Curved Shaft #P1500

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Poulan 32 cc string trimmer mod.# ppb100

Unit will start and run if the choke is at 1/2 ... the primer bulb is full but has a swirl of air bubble's.. I'm sure it is an air problem but where? .. unit will die if the throttle is squeezed,,, thank's for your time,,, william r2000@aol.com

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  • whtyford65 Apr 17, 2009

    unit will only run at idle and smokes.

    mine is the 25cc p 1500

    will die if i use any throtle at all

  • Anonymous Apr 20, 2009

    erratic running then stops

  • Anonymous May 03, 2009

    I have the same issue and discovered that there was a pinhole in the primer bulb. That may very well be the culprit. I'm installing a new one and hope that will do the trick.

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Try checking hoses and bubble.mine did that cleaned carb with clener also change air filter mine was clogged ran fine after change air filter

Posted on May 13, 2012

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After you have done all the suggestions #1 gave you, make sure the tubings are good. They deteriorate over time. Also be sure to check the spark arrestor. This is part of the muffler. Good luck

Posted on Nov 16, 2008

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Try checking the fuel filter, not sure of the exact location but should not be to hard to find. Try looking in the gas tank if it's not readily located. If small 2 cycle engines sit for any length of time ( 30 days or so) with fuel in them the filters can become clogged. If your not going to use it for extended periods or storing it for the winter make sure you drain the fuel tank and run the carburetor dry.

Posted on Nov 14, 2008

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1 Answer

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There could be a bad check valve in the carb or a gasket leaking or even a pin hole in the fuel line. Since its the primer bulbs job to remove air from the carb and replace it with fuel; as long as the unit runs fine I wouldn't worry about it. A leaking gasket can be fixed with a rebuild kit. Bad check valve will require replacing the carb.

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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.

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I bought a Poulan PPB100 at a yard sale for $20.00. I got it home and got it started and running but it leaked gas like no tomorrow. I took it apart to see what was needed and found that all the fuel...


This is an ongoing issue for users, and rightfully so. Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.
If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank.

Please vote on this solution.

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The smaller line is connected to the fuel filter in the tank and goes on the carb body opposite the end with the hole in the cover. A larger diameter line coming out of the tank is the fuel return line and has the little connector on it just inside the tank to hold it in place there
It goes on the carb body (if primer is on carb) by the bulb.
If there is an external bulb...the small line is the same...there would be a larger line going from the carb body (nearest the end with a hole in the cover) to the smaller nipple on the primer bulb. A third larger diameter line would be connected to the larger nipple on the primer bulb and running to the little nylon connector inside the tank. This is the fuel return line and the smaller diameter line is of course the fuel supply line.

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The primer bulb needs to be replaced. It is introducing air to the system and not allow fuel to flow. Replace it and check the fuel lines while you are at it.
HTH
Good Day

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Ryobi 790r i have changed the gas line and the primer bulb . the primer will mash in 1 good time and then gets very hard to mash in . i fully choke it and it will crank but only for 3 seconds until it...


You cannot flood the engine by pushing the primer bulb too much, unless the hoses are hooked up backwards. The primer does not push gas to the carb, it sucks gas through the carb and returns it to the tank. Top barb on primer is the hose coming from the return side of the carb and the bottom fitting is the hose going to the return fitting on the tank. Look inside tank, it is the one without the filter on it, just a flange with a hole in the center.

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When you say the primer "gets hard to mash", do you mean it is hard to push in or is it very slow to refill and return to the home position? If it is hard to push in and the bulb is full of gas and the hoses are on correctly then there must be a plug in the line going to the tank or the vent in the gas cap is not working. If it does not return, then it is most likely a plugged filter, plugged line from the tank to the carb, plugged screen inside the carb or a stuck needle valve. The primer is creating a slight vacuum to pull the gas through the carb, which is what the carb does when the engine is running. If there is a full or partial restiction on the supply circuit neither the primer nor the carb can pull enough gas for the engine to run. May need to disassemble carb and clean out any varnish, gunk or plugged ports/jets. Use spray carb cleaner. May want to think about a diaphagm and gasket kit if you do it yourself. If you do not feel confident in taking apart the carb, then take to a repair shop.

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