Walbro carb ?? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-26-2010, 11:31 PM   #1
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Smile Walbro carb ??

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I've just converted a Ryobi engine. It has a WT149A Walbro carb on it. I removed the remote primer bulb that was on the housing. The engine runs very well, but when I lit the tank above the carb it floods right away and if I lower the tank th eengine quits. When the engine is not running the fuel flows freely in and out of the tank to the carb. Is there something wrong with this carb or do I need the primer bulb installed? The vent on the tank is open to tthe atmosphere and the only line I have attached to the carb is the fuel line. ANyone know the problem?

Thanks. George
I keep having the same mechanical problem. I've got a loose nut on the transmitter!

G-manz35 AKA. George St.Amant MAAC#75084

Last edited by g-manz35; 07-27-2010 at 09:30 AM.
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Old 07-27-2010, 07:20 PM   #2
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Re: Walbro carb ??

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Old 07-29-2010, 12:28 PM   #3
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Re: Walbro carb ??

George. when you did the conversion, what did you used to replace the big open hole where the primer bulb was? The carb is a pump driven carb, and the pump diaphram, also opens and closes the needle valve, so if fuel is flowing, either the valve is stuck open, or theres an open spot in the carb someplace allowing the fuel to flow out.

And being that it is a pumped carb, fuel tank placement really shouldn't matter.
happy flying
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Old 07-29-2010, 01:08 PM   #4
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Re: Walbro carb ??

Similar to what juice90 was saying. Make sure you don't connect the tank to the primer inlet. If you do then the fuel will act the way you are describing.It should be connected to the other inlet and the primer inlet should be blocked.
Rob Weiss

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