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Engine starts but won't run

Manual primer works. hard to start. won't run but 10 seconds.

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6ya6ya
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Posted on Jan 02, 2017

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bbreton
  • 437 Answers

SOURCE: Ryobi blower will not start unless primed by

If it is under 2 years old, I would take it to a warranty repair center. The carburetor have been giving some problems so they have needed to be replaced because they are sub standard quality.

Posted on Sep 28, 2009

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SOURCE: Won't start , can not get primer to work even

ryobi 790r string trimmer has a high idle. gas throttle handle will not return to starting position.

Posted on May 16, 2011

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1 Answer

Why doesn't B & S engine start?


pull the carby and clean out the corrosion blocking the main jet

Apr 22, 2016 | Garden

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My prime bulb looses pressure and first start is hard. I have to remove fuel line from filter and cover with thumb prime re install then first start takes time.


Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.

Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.

If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.

Dec 19, 2014 | Boating

1 Answer

How do I start a weedeater fb25?


Press primer bulb 6 times
Move throttle lever to start position
Move choke lever to full choke position
Pull starter rope sharply until engine attempts to start, but no more than 5 pulls.
Move choke lever to half choke position. Pull starter rope sharply engine runs. If engine hasn't started after 5 pulls, repeat all steps above.
After warming up for 10 seconds, move choke lever to run position.

Manuallib.com has a manual for this model available for free download

Oct 20, 2014 | Weedeater Garden

1 Answer

New primer bulb but engine won't prime


remove and clean the carby. clean out the main jet. ensure that there is nothing stopping the primer circuit from working. There are two valves under the primer bulb and a spring. when you push in the bulb fuel is squirted into the manifold When you take your finger off the bulb the spring pushes it out and new fuel is drawn past a valve to fill under the bulb. Pushing in again closes that valve and opens a second valve which allows the fuel into the manifold again

Apr 26, 2013 | Garden

1 Answer

Bolens cultivator model BL410 won't keep running


clean the screen inside the muffler

Aug 03, 2012 | Garden

1 Answer

My 25cc craftsman weedwacker will not start it is not getting fuel prim bulb will not fill up lines are full of fuel when i pull them off new lines took csrb off and blue out with air. if i put fuel min...


Clean you needle/ seat inside carb pull apart and clean all out and try it off the w.w. to see if primer works ,also the primer has a check valve internally also make sure that is working, if the primer won;t pull gas through carb it won;t run 2StrokeJim

May 17, 2011 | Craftsman 25cc Gas Line Trimmer

1 Answer

Will start and run for 3 seconds and then stalls


Does it have a primer bulb on the side of the engine? If so, it is probably a bad bulb, or the hoses connected to it. You can prime enough gas to start the engine and briefly run it, but the cracks in the bulb or hoses allow air to get sucked into the carburetor not gas. This is what kills the engine. You can pick up a repair kit at just about any hardware store for less than $10.

May 27, 2009 | Garden

2 Answers

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.

If you can see gas and air bubbles moving through the primer and into the tank the hoses are on correctly. If you see bubbles going in the correct direction and then reversing when you remove your finger from the bulb, then the check valves in the primer may be bad. Replace primer.

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.

May 05, 2009 | Garden

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