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McCulloch Promac 555 starts and immediately dies due to deep pool of fuel surrounding carb(very rich). does not appear to be leaking around or through fuel line, or gasket between top and bottom of tank. i pulled the rope about twenty times after cleaning and adding fuel. immediately removed air cleaner and found about half an inch of fuel around carb. would a ruptured diaphram leak that much that fast or is it worse than a simple rebuild?

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The diaphragm by itself can't leak as it is in a sealed chamber, but the fuel flow through the carburetor and past the fuel metering valve will not be controlled properly. Cleaning and a re-kit should put a stop to the flooding. Go to: for a 12 page article on Walbro brand carburetor theory and troubleshooting which applies to other brands of carburetor as well. Hope this helps!

Posted on Jun 14, 2010

  • tadams15 Dec 20, 2010

    Check the tank gasket again. In fact if you haven't replaced it recently, go ahead and replace it or repair with silicone. I have this same model

  • tadams15 Dec 20, 2010

    Somehow the rest of my comment was cut off. What I said was that this much fuel in the carburetor chamber was a strong indication of the fuel tank gasket failing. I had the same trouble ten years ago



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