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

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Have an Echo 251 and it is not a carb or spark problem. Won't stay running. Timing?

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Posted on Jan 02, 2017

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Dolfoff
  • 148 Answers

SOURCE: I have a Echo PB/251 Gas Blower which I recently

Check the muffler and/or spark arrestor screen in the muffler outlet pipe and also the engine's exhaust port behind the muffler. These are prone to carbon-clogging and the engine cannot "BREATHE" enough to reach full throttle. If all-clear in the muffler, go back in the carb and locate the inlet screen directly opposite of the inlet needle. Carefully pull it out with a pick and hold it up to a light source. If you cannot see thru it, replace it. This is another, (less) common area of obstruction.

Hope this helps,
Dolf-

Posted on Oct 18, 2009

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  • 100 Answers

SOURCE: running fine then suddenly stopped.

sounds like it has leaking crankshaft seals...or I have had them break a ring and score piston and cylinder...you can verify this by removing muffler and checking piston through there ...if no scores, I would think seals are faulty...

Posted on Sep 21, 2010

  • 85 Answers

SOURCE: echo pb-251 blower runs but cant reach full

may need to adjust high and low jets

Posted on Jan 27, 2011

rycgl
  • 1545 Answers

SOURCE: My echo pb 251 will start momentarily if I push

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

  • 1 Answer

SOURCE: My Echo Leaf Blower (PB-251)

I had same problem with my blower that was several years old and had always run great. Air filter was clean so I changed spark plug and it ran like new again for $2.50:-)

Posted on Jul 23, 2011

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2 Answers

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.

May 14, 2015 | Echo Garden

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Echo PB-251. Wont run full speed,changed ,plug,filters


I'm 99.9% sure it's the fuel line. The ethnoll in gas really shrinks the oem fuel lines

Jan 13, 2015 | Echo Pb-251 Leaf Blowers

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My echo pb-251 leaf blower won't start and sounds like a slight backfire - what is the likely cause?


Consider the flywheel. This model uses a flywheel with a built in key. If that key is bent or broken the timing would be off which would explain the backfire. You can source a replacement unit from eReplacement parts. Unfortunately the flywheel is 44 bucks and you have to be able to dismantle the unit to replace it. These blowers cost 200 dollars new. So you have a little wiggle room here. If the flywheel is good you may have a bad coil which can cause timing problems or weak spark. But those are 76 bucks so look at the flywheel first.

Jul 01, 2014 | Echo Gas Blower 135 MPH390 CFM Blower...

1 Answer

Echo pb-251 won't run with out choke


I would say that Daren is on the best track here for repair. Myself i agree with the fact that your carb has some sort of blockage. Start with a good carb cleaning. Good Luck....

Nov 11, 2013 | Echo Gas Blower 135 MPH390 CFM Blower...

2 Answers

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

May 26, 2011 | ECHO, Inc. PB-251C Handheld Blower

1 Answer

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?


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

Apr 04, 2011 | ECHO, Inc. PB-251C Handheld Blower

1 Answer

Running fine then suddenly stopped. could not get it to start back up, so i took it to the local shop. they cleaned carb and verified it had plenty of spark. they said maybe the carb was bad. i installed...


sounds like it has leaking crankshaft seals...or I have had them break a ring and score piston and cylinder...you can verify this by removing muffler and checking piston through there ...if no scores, I would think seals are faulty...

Sep 21, 2010 | ECHO, Inc. PB-251C Handheld Blower

1 Answer

I have a Echo PB/251 Gas Blower which I recently starting having problems keeping it to run. I have to keep the choke on to let it stay at a fast idle. I have taken the carb apert along with all gas and...


Check the muffler and/or spark arrestor screen in the muffler outlet pipe and also the engine's exhaust port behind the muffler. These are prone to carbon-clogging and the engine cannot "BREATHE" enough to reach full throttle. If all-clear in the muffler, go back in the carb and locate the inlet screen directly opposite of the inlet needle. Carefully pull it out with a pick and hold it up to a light source. If you cannot see thru it, replace it. This is another, (less) common area of obstruction.

Hope this helps,
Dolf-

Oct 18, 2009 | ECHO, Inc. PB-251C Handheld Blower

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