Echo Gas Blower 185 MPH 900 CFM Blower PB620ST Logo
Posted on Sep 02, 2011
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Blower is stalling out at high power. - Echo Gas Blower 185 MPH 900 CFM Blower PB620ST

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Kelly

Kelly

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  • Master 3,740 Answers
  • Posted on Sep 02, 2011
Kelly
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Joined: Jan 01, 2010
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Hi and welcome to FixYa, I am Kelly

Stalling at high speeds is caused by fuel starvation.

Causes for fuel starvation are:
1. Pin hole in the Primer Bulb (Item 3) this link: PN: 12538108660
http://www.partstree.com/parts/?lc=echo&mn=PB-620++S%2FN%3A+09001001+-+09999999&dn=7257

2. Fuel filter in gas tank is clogged. (Item 5) this link:
http://www.partstree.com/parts/?lc=echo&mn=PB-620++S%2FN%3A+09001001+-+09999999&dn=7271

3. Fuel lines damaged or cracked (Items 7 - 11) above link

4. Missing gas cap vent (Vapor lock) Items 15, 16 of # 2 link above

5. Diaphragm / gasket / float needle problem inside carb. (Carb service manual below see page 7)
http://www.zamacarb.com/pdfs/TechGuide_2007.pdf

The gasket / diaphragm kit that usually corrects this is item 34 this link: http://www.partstree.com/parts/?lc=echo&mn=PB-620++S%2FN%3A+09001001+-+09999999&dn=7257

I doubt that making fuel mixture adjustments is going to correct the symptom you have.

- Your going to have to check fuel flow from the fuel tank to the carb connection.
- Check for any loose screws on the top and bottom of the carb (tighten and test)
- Dis-assemble, clean with carb cleaner, reassemble & test
- Replace gaskets and Diaphragm making sure float metering needle is clean

Hopefully with this information you can isolate and repair the problem.

Thanks for choosing FixYa,
Kelly

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