Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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By having the air bubbles in the line it sounds like there is a restriction in the fuel system that is not allowing fuel to flow fast enough from the fuel tank. I would check the fuel tank vent which is normally built into the fuel cap. You can do this by just loosening or removing the fuel cap and see if it makes any difference.
When the engine stalls can you restart it right away? Have you checked spark going to the plug when or while this is happening to see if by chance you are loosing spark?
Okay, about the only thing that it could be is the carburetor jetting. If it will restart right away with the choke pulled out this tells me that it is not the ignition system or the fuel pump. I would take the bowl off of the carburetor and check for dirt or trash and make certain that the jets are clean.
That's odd that the tygon would collapse but that would explain a lack of fuel possibly causing the engine to not run under a load when it needed the extra fuel.
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