Question about ECHO, Inc. PB-251C Handheld Blower

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My echo pb 251 will start momentarily if I push the bulb about 5 times but it won stay running. what "pumps" the fuel after it starts?

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  • Echo Master
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There is a small diaphragm inside the carburetor that uses the intake pulse from the engine and the rise and fall of air pressure to pump the fuel. Here is how it all works. The pulse passage is very important and is fairly small, going from a hole in the carb to a hole in the carburetor adapter to a small hole in the engines' cylinder. Of course though, the pulse signal is created by the engine.
You need to check the condition of your in-tank fuel filter, the fuel lines and the carburetor itself. The small parts in the carb tend to dry out over time and cease to function. Gasket and diaphragm kits and complete rebuild kits for the carbs are available. Here is how they work.

http://www.zamacarb.com/pdfs/TechGuide_2007.pdf

Posted on Apr 04, 2011

  • Ron C May 08, 2014

    Wow! Very excellent Tech Guide. Thanks!

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Echo PB 251 won't run. replaced plug, gas, fuel filter, air filter. took carb a part, and cleaned with carb cleaner, used the compressed cleaner to clean out venturis/ports.


Wow! with all you have done it should run. Be sure the switch is on but if you are getting spark, it should be on. I would take it to the echo place for service.

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I know you checked the plug, but it can fire outside the cylinder and then not fire under compression.
If you have compression, fuel, and spark at the right time you should get combustion.

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1 Answer

My Echo PB-251 leaks gas out the exhaust when stored, becomes flooded and hard to start.


well 1st thing with the amount of alcohol that's in gas now days it's no longer a safe/good idea to store even for short time power tools with fuel in them , second are u sure its coming from exhaust or maybe near there ? reason I ask is that maybe there's a fuel hose that's leaking and it runs out near there , this needs attention as fuel could continue to leak out when tool is in operation as well , leaking hoses are a very common problem in todays power tools , from a 600 hundred dollar huskavarnia to a 40 dollar echo none of them make fuel hose they all buy them (probably from same place)

Aug 30, 2011 | ECHO, Inc. PB-251C Handheld Blower

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Echo pb251h. Blower will only stay running if i pump primer knob. Carb was rebuilt, changed fuel filter, checked exhaust port, insulater appears to be ok, compression test around 100psi,new fuel lines and...


when the carb was "rebuilt" Did you pull out the screen and clean it out and also did you pull needle and diaphragm out and clean it out good, because if the needle is not working or the neoprene tip is swollen your needle adjustment will be out of whack,sometimes carb cleaner will make it swell up to where it won't open enough to get fuel through it....suggest you replace the needle and adjust your height of the tab to flush with the body of carb and make sure you have a good diaphragm in it along with new check-valve diaphragm, then make sure your primer is hooked up right ..it should be pulling fuel through the filter to carb and through carb and back to tank,your problem is definitely in the fuel system, keep trying different things you will figure it out

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1 Answer

I bought a new echp pb-251 blower last year. towards the end of last season the blower seemed to run sluggish. I attributed it to the cold weather and stored it properly with fuel stabilizer. Now here in...


Hi, there is a wire screen in the exhaust outlet that blocks up with carbon deposits. It can be removed and cleaned with a wire brush. If blocked it will give you the problem you have and also make the blower quieter than it should be. Regards Phil.

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My Echo Leaf Blower (PB-251) will not run at high speed. It is running to rich. Help please. Charlie


I've been fighting with an Echo PB-251 blower and an Echo SRM-225 string trimmer since near the end of last lawn season (this is the forth season I've had them). Along comes a thread on a firearms forum and lo and behold the answer to the problem is spelled out in terms even I can understand.

After reading that thread (which attributes the problem of the engine bogging down when throttle is activated to collapsing fuel lines) I was going to just replace the fuel lines, but I discovered that there are kits that include new fuel lines, rubber grommets, filters, clips and cap seals for about $13.00 each. Hell, the kit for the SRM-225 even provided a new primer bulb. Ten minutes after the UPS truck delivered them to my door I had both machines running like new again. If you've tried other things and it still hasn't worked I highly suggest you try this.
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Jan 05, 2011 | ECHO, Inc. PB-251C Handheld Blower

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