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Have Yard Machine (model 12B264c062) 22inch B&S 4 HP mower. Carb does not have fuel bowl with float and needle valve. Engine starts easy enough but will not run at proper RPM or smoothly. checked and confirmed all igniton parts are working properly. Engine will run at proper speed JUSY AS FUEL TANK is running out. HAs to be a fuel flow problem - acts like floar out of adjustment etc. Appears that tank has some kind of reservoir for fuel metering, but can't figure out problem. Again has to be fule flow as engine races back to normal RPM as it runs on last 20 -30 seconds of fuelin tank????????

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  • davidwashley Jul 03, 2009

    Hi thanks very much for the reply. One thing I forgot to add is that after determining my problem was definitely fuel related, I began trouble shooting in the typical ways like restricting air to carb while engine is running (like a choke valve would do) to see if rpm would improve/stabilze. It was just the oposite. Theonly way I could get the engine to run at normal (smooth) rpm was by blowing air into the carb with my air hose. So I relaized there was too much fuel going into the carb. Also while loking for info on the net I discovered the same area of concern as you pointed me to - this diaphram. Some of the discusion I saw about diaphrams though was where engine was not getting gas. Again in my case its too much. Will burn a tank in half the time as usual in its current state. So back to your recommnedation - with these two addtional diagnosis you feel like I need to replace the diaphram/ Tahanks again, David



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There is a small diaphram on the side of the carb that simply wears out. It's rubber coated mesh and the rubber coating breaks down and it stops pumping fuel into the carb. Sometimes you can run with the choke on partially, but it will burn 10 times the amount of fuel and cause more damage to the engine itself. I think it's about a $10.00 part.
have the carbureator rebuilt, ethonal breats down into a gum that cloggs passages in carb need to be very clean to run properly. use stabil (fuel additive) in outdoor equipment gasoline and Sea Foam is also a exelent fuel additive .

hope this will work for u

Posted on Jul 03, 2009


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Here is what you need to do:

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Thanks for using FixYa.


If the above does NOT apply to your engine then please respond with the engine type model number off of the air shroud just above the spark plug. ALL of the type model numbers will be needed. Also in some cases the serial number.

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