Question about Echo Pb-251 Leaf Blowers

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Pb 251 primer bulb not working - Echo Pb-251 Leaf Blowers

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6ya6ya
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Posted on Jan 02, 2017

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

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I cant get it to start. The primer bulb wont refill with gas


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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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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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