Question about Craftsman 25cc Gas Line Trimmer

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I just replaced fuel lines and primer bulb when I prime the engine it starts but dies out. I found when the engine is dying out if I push the primer bulb it will keep running. Why will this not keep running on its own? I cannot operate it if I have to keep pushing the primer bulb every 3 seconds

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Inside the primer bulb there is a umbrella check valve that need to be replace. It is causing air in the fuel system

Posted on Aug 02, 2010

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1 Answer

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

2 Answers

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

Will not start


More information would be nice. How old is the cultivator? How long has it been since it last ran?
Possible causes for the primer bulb not to fill: 1. the bulb has a small hole in it (need to replace the primer bulb, usually a pretty easy job, just remove a couple of screws, remove the old bulb and install the new one). 2. One of the fuel lines may have a break or hole in it. If the cultivator is old enough a fuel line may have dry rotted and came apart.
A couple of things to try: Put fresh fuel in the tank then remove the air filter and put a few drops of fuel in the carburator then try to start the unit. If it starts an runs for a few seconds and dies the problem is the carb. is not getting fuel to the engine. If it still will not start check the spark plug. Is it fouled? Worn out or broken? If in doubt replace the plug.

May 20, 2014 | Troy-Bilt TB146 EC 4-Cycle Garden...

1 Answer

Poulan Pro Chainsaw, PP3516AVX


is the cap vent plugged?

Aug 18, 2012 | Poulan Garden

1 Answer

Why does the engine get flooded when i prime it


I did the same on my Hedge Trimmer [flooding] turned out i put new lines on wrong, The primer pulls the fuel through the carb not push like you would think. Google E replacment Parts site they have DIY vids on bulb replacment which helped me
Paul

Mar 31, 2012 | Garden

1 Answer

Engine runs for a short time then dies, replaced plugs, air filter, in line gas filter, and rebuilt fuel pump


I had a B&S lawn mower engine that did this unless I kept pushing on the prime button and I found I had a Cracked primer rubber bulb. Maybe you have something similar or another type or carb problem.

Jul 28, 2011 | Briggs & Stratton Tools & Hardware -...

1 Answer

I may have lines on Backwards??


filtered line from tank goes into top inlet at carb. bottom inlet receives line that goes to carb side of primer {draw side} 3rd line goes from push side of bulb bach to fuel tank.

Mar 25, 2009 | Poulan Pro 16-Inch 38 cc Anti-Vibration...

2 Answers

Leaf blower will not continue running unless primer bulb is pushed intermittently


Hi

Priming the engine(put some gas in the sparkplug hole)..If.Start the engine.If only the gas from the cilinder is burned change the lines prom primer bulb.

best regards savumihai71

Oct 25, 2008 | Craftsman 4 Cycle Blower/Vac

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