I replaced the fuel line thinking it was cracked but the air bubbles come from the carb itself? the other carb does not do this and of course it is creating a lean side for first 10 minutes then the air is gone. till engine is shut off air fills in the line again?|||Air in the lines is normal and do not have any effect on how it runs. Air will seek the highest point and remain there. Yes, the air comes from the carb and not the tank. The carb is vented. Your carb only needs enough fuel to fill the bowl and keep it filled.
Only fuel injected machines use a pressurized fuel system.
If you have a lean condition, it is not from this but could be from a dirty or varnished carb.|||As a general rule if bubbles form in the carb, my suggestion would be the service both carbs. Its possible that the gasket between the top and bottom of the carb has failed allowing air to be sucked into the fuel bowel.
Ja.
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