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Weed trimmer primer bulb does not pump full, and trimmer will run out of gas I have a Mcculloch edge trimmer. I replaced the two fuel lines but the fuel Primer/Bulb does not fill. There seems to be be an air bubble that does not want to feed through. Where the fuel lines goes into the holes in the tank, does the intake and overflow fuel lines both be submerged under the fuel level, or is there a possibility that there are an air leak somewhere?

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No, the overflow line does not need to be submerged. first make sure that the hose connections are tight and the "O" ring or gasket inside the gas cap is not damaged or missing. when replacing both lines at once, its easy to get them mixed up, so make sure they're not. remove the carbuerator and inspect the gasket; it should be soft and flexible, if its hard or brittle it needs replaced. it doesn't take much to clog it, so spray carb cleaner, available at local auto parts store, inside the fuel rails and blow out with compressed air. there might also be a pin hole or bad seal in the primer bulb and need to be replaced.

Posted on Nov 28, 2008

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Take the bottom off the carb (single silver screw). Inside you should see a small screen filter. This is rigid but can be pried out.
Remove and replace it, or clean it with carb cleaner. This filter clogs very easily, but must be totally clean in order for fuel to flow through. (This solved my fuel flow problem after having tried everything else ! )

Posted on Aug 09, 2009

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Why won't it start?


I hate those little bulb primers. They get cracks & pin holes that completely ruin the operation of blowers , mowers, & weed wacker half of which you can never see. But that's just the beginning. The fuel lines do the same thing. And the fuel lines are made out of a material that cracks due to contact with fuel in 5-8 years. So here's my rule of thumb: 1) replace all the fuel lines & bulb if there's every any problem what so ever with priming the tool. 2) rebuild the carb is fuel drips out. Since I follow this rule now I make trips to the store a lot less & I've had a 100% success rate at fixing small motors. A little hint, some Ace Hardware stores sell the fuel line that does not crack by the foot. It's about $1.89/ft. Good luck.

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Sounds like the check valve in the primer base is stuck/clogged/damaged, assuming the fuel lines and fuel filter are intact and not clogged, It will have to be replaced.

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1 Answer

Why does my craftsman bushwacker hedge trimmers not go fast when I have it full throttle?


if engines stumbling when at full throttle , ck to see that your getting full fuel flow ( lots of bubbles in primer bulb are a sure sign of not a good flow) , locate the fuel filter inside fuel tank , ck it for a dark color ? if so replace it , also try adding some normal car fuel system cleaner to your fuel next time u run it for a few minutes , this helps to loosen stuck deposits inside the carb

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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.
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I'm trying to get an old weedeater/poulan 22" excalibur hedge trimmer running for my son. In the past someone has cut a fuel line going to primer bulb. I replaced that line and when I use the primer...


There are 2 different set ups for fuel lines on these 2 stroke carburetors. One has a remote primer/purge bulb and the other has the primer/purge bulb on top of the carburetor. Here are instructions on how both kind work and how to service them.

The small diameter line out of fuel tank (has filter in-tank on end) connects directly 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. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. 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 sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so If you have any more questions, please post back. I will see your comment and be glad to help you,

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1 Answer

My Ryobi start great but when I change it from start to run stays few seconds and died


  • Alow the engine to run for longer on the start setting before you switch to run
  • Ensure air filter is clean. Foam elements can be washed with hot water and detergent. Paper elements can be cleaned with compressed air blown from the inside of the filter but ideally should be replaced.
  • Check fuel lines aren't kinked or blocked restricting fuel flow.
  • Ensure fuel filter isn't dirty. This is probably located at the end of the fuel line in the tank.
  • The fuel lines may have become airlocked.This can happen if the tank is run dry. If the trimmer has a primer bulb, alternatively press it several times and then try to pull start the engine with choke on. Repeat this several times. The primer bulb should feel spongy and fill with fuel.Once the engine kicks, switch to run.

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1 Answer

I have a weedeater brand hedge trimmers 18 inches long. I rebuilt the carb and replaced fuel lines and filter. The unit ran fine until the last two times that I have tried to use it. It will run and...


have you checked the fuel plate thats in the bottom of carb? they tend to dry up and because rubber the 2 stroke fuel makes it dry and shrink, then it no longer pumps fuen into cylinder

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1 Answer

The fuel lines rotted which line goes where


Rotten fuel line debris may have also made it into your carburetor, where there is a very fine mesh screen to catch it. To check, remove the cover on the carb that has the primer bulb on it or the one that doesn't have a hole in the cover.
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.

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1 Answer

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2 Answers

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