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Old 10-02-2010, 10:44 PM   #1
Torque454
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Default Fixing a couple leaf blowers - Walbro carb issues

I am working on a couple hand held blowers (one craftsman and one Poulan pro BVM200 type 1 both of which are identical since Poulan made the craftsman line of power equipment or did when this blower was made) and also working on one Weedeater brand Featherlight FL1500 blower. I know that in all three cases, the problem is fuel related.

The poulan I have rebuilt the carburetor on (Walbro WA-229, same one on the craftsman) and I have a kit for the craftsman one as well. I also rebuilt the carb on the weed eater blower. The weed eater blower will run after I prime it. It will only run for a minute or two before stalling and wont run again until you prime it again. When you push the prime bulb, no matter how many times you push it you still see some air bubbles pushed into the return line. I see that the carb is wet but i dont see any visible leaks. The fuel lines are new and there are no leaks between the filter at the end of the line and the carb. I think it may have an air leak around the primer bulb but i'm not sure. The bulb itself is dry.

The poulan I know is leaking around the primer bulb and that is probably its problem too. I just put kits on both of those carbs (Walbro WT-557 on the weed eater) and i am sure that I didnt do that wrong. I can rebuilt a vehicle carburetor and they are much more complicated so I dont think its something I am doing wrong but I do find it odd that both of them seem to be suffering from the same problem. I think for some reason they are leaking between the carb and the bowl where they meet at under the metal retainer. Does the primer bulb need to be replaced like a gasket every time its removed?

Help please!
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Old 10-02-2010, 11:20 PM   #2
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

If it is sucking gas into the bulb and not leaking out, the bulb is probably ok. I have had the check valve stuck for the return line and that will cause air to get back into the carb.
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Old 10-02-2010, 11:38 PM   #3
Torque454
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

Well the primer bulb is sucking fuel. I dont know if the carburetor continues to suck fuel or not, but i think it does. As ive mentioned the carb does seem wet with fuel from somewhere but i'm not sure where. I think it might be between the primer bulb and the top of the carb. If that is the case then I think it is the bulb. However, I am unsure where this check valve is that you are referring to. Could you explain that to me a little more?
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Old 10-03-2010, 07:35 PM   #4
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

It appears the Featherlight FL1500 blower will run but it is sucking air from the fuel line because there is no filter on the end of it (which is a weight also and keeps the end of the fuel line at the bottom of the tank where the fuel is at). I didnt put it back on when i replaced the fuel hoses. Now i think I will put it back on and see how it runs. It was sucking air bubbles and as long as I kept it full and the hose couldnt suck air it would run as long as I wanted it too.

Not sure whats up with the other two yet.
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Old 10-03-2010, 07:53 PM   #5
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

Glad you got that one!
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Old 10-03-2010, 08:14 PM   #6
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

Check the valve in the plate that the primer bulb is on they get plugged and it does what you are saying
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Old 10-03-2010, 08:24 PM   #7
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

Is that the little rubber thing in the plate below the bulb?
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Old 10-03-2010, 08:35 PM   #8
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

yep stick a really small wire in the middle and it should solve your problem is the bulb real hard to push
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1973 18 automatic (2)
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1979 D160
1994 416-8

1974 Cub 108
1971 Cub 127
1998 GT5000 pulling tractor
1976 SS/16 Twin
1986 Gt 18 Twin
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Old 10-03-2010, 08:44 PM   #9
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

No but the other day it was refusing to spring back after pushing it. It would eventually but it took several minutes. Ive messed with it since then and its working fine now. I think i had one of the mebranes or gaskets out of place.
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Old 10-03-2010, 08:50 PM   #10
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

more than likely that is the problem
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1973 18 automatic (2)
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1979 D160
1994 416-8

1974 Cub 108
1971 Cub 127
1998 GT5000 pulling tractor
1976 SS/16 Twin
1986 Gt 18 Twin
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Old 10-03-2010, 09:17 PM   #11
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

I'll be sure to clean that thing out. They come out and just press back in right?

Also where is the jet located on these things? On the two particular carbs i am working on, they dont have high and low speed needle valves. They are fixed orifices somewhere. The WA-229s have one adjustment screw with a limiter cap on it that will only move about an eighth of a turn maybe a little less than that. Is that the jet? Do i remove the limiter cap, count the turns in and then remove it and clean it?
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Old 10-03-2010, 09:22 PM   #12
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

I don't think those pieces under the primer bulb come out just push a small wire in the center and as far as the needle jet yes remove the limiter count the turns and put it back the same way hope this helps
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1973 18 automatic (2)
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1979 D160
1994 416-8

1974 Cub 108
1971 Cub 127
1998 GT5000 pulling tractor
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Old 10-04-2010, 12:58 AM   #13
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

Theoretically, if the limiter was to somehow 'misplace' its humpies & bumpies, it would then become tuneable & be much less of a PITA when dealing with 'X'% ethanol, eh?
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Old 10-04-2010, 08:42 PM   #14
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

Quote:
Originally Posted by H-D View Post
Theoretically, if the limiter was to somehow 'misplace' its humpies & bumpies, it would then become tuneable & be much less of a PITA when dealing with 'X'% ethanol, eh?
???? You talking about the limiter cap on that screw?
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Old 10-04-2010, 11:45 PM   #15
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Default Re: Fixing a couple leaf blowers - Walbro carb issues

Yeppeth!
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