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Walbro Carb Problem


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#1 Gabriel OFFLINE  

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Posted May 10, 2014 - 10:05 PM

I rebuilt a Walbro carburetor that's on a Poulan Pro BVM200 blower/vac. It is a 2-cycle engine. I can't seem to get the carburetor to supply fuel to the engine. I can get fuel in the primer bulb, and other areas, as shown by the arrows in this diagram. Should I be able to see some fuel come out somewhere when I push the primer bulb?

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#2 superaben OFFLINE  

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Posted May 10, 2014 - 10:20 PM

The fuel should come out the return line to the tank when you prime it. 

 

Is the diaphragm and gasket on in the right order?  Is the needle metering lever adjusted right?

 

Ben W.


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#3 New.Canadian.DB.Owner OFFLINE  

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Posted May 11, 2014 - 07:32 AM

There is a cross-over passage in the middle section that moves fuel from the fuel pump side to the metering side.  There is also an impulse passage from the engine to the carb to power the fuel pump.  Are those blocked?

 

http://wem.walbro.co...rviceManual.pdf


Edited by New.Canadian.DB.Owner, May 11, 2014 - 07:33 AM.

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#4 Gabriel OFFLINE  

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Posted May 12, 2014 - 09:43 AM

The fuel should come out the return line to the tank when you prime it. 

 

Is the diaphragm and gasket on in the right order?  Is the needle metering lever adjusted right?

 

Ben W.

I can see fuel move in the return line. I should probably check those things a little closer.


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#5 Gabriel OFFLINE  

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Posted May 12, 2014 - 09:44 AM

There is a cross-over passage in the middle section that moves fuel from the fuel pump side to the metering side.  There is also an impulse passage from the engine to the carb to power the fuel pump.  Are those blocked?

 

http://wem.walbro.co...rviceManual.pdf

I suppose they could be blocked.



#6 Guest_rdehli_*

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Posted May 13, 2014 - 07:55 PM

blow those passages out with your air gun   it should help.


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#7 Gabriel OFFLINE  

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Posted May 13, 2014 - 08:33 PM

blow those passages out with your air gun   it should help.

Thanks. I took the whole carb apart and cleaned it again, then we carefully checked all the passages, then I blew all of the passages out. I sprayed some carb cleaner in the engine (before I took the carb back off), and it started on the first pull. I'm trying to check everything over carefully, so to make sure I'm not missing something obvious. I will keep you all updated as I move along with finding out what's wrong with the carb.



#8 Guest_rdehli_*

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Posted May 14, 2014 - 08:14 PM

thank for the up date
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#9 Gabriel OFFLINE  

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Posted May 14, 2014 - 09:46 PM

Thanks. I took the whole carb apart and cleaned it again, then we carefully checked all the passages, then I blew all of the passages out. I sprayed some carb cleaner in the engine (before I took the carb back off), and it started on the first pull. I'm trying to check everything over carefully, so to make sure I'm not missing something obvious. I will keep you all updated as I move along with finding out what's wrong with the carb.

 

thank for the up date

I got it running!!! I wonder what was wrong??????? Maybe something was stuck, and I dislodged it when I cleaned it again and blew all the passages out.






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