Join Date: Oct 2006
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It might be that simple...but it might not. Based of a very aggravating multi-year experience that I recently solved, I would be cautiously optimistic. Was the motor running and then quitting at 1/2 - full throttle, or only at idle speeds or low throttle? I'm somewhat concerned that you may also have an issue with your carburetor, especially if you have tanks/lines that old with crud that broke free into the carb.
One good indication that you have too much air (which it sounds like you were describing) is to choke the engine. If your engine still runs under choke, there is air in the fuel line. It's also possible that an air leak was causing you to lose prime. If the engine runs while persistently squeezing the priming bulb, you probably had a priming issue. These are two simple tests you can check.
If you still have some issues, I would look next at buying a new tank and a new fuel line, and treating the fuel in the new tank with Seafoam engine treatment. If you have crud in your carb, the Seafoam is a much less expensive alternative to a carb cleaning/rebuild.
"Sattar" Cal 25, #256