How do you know the tank and fuel line connector are good? Will those motors stay running if you keep pumping the primer on the tank? The primer actually pumps gas directly and does not build any pressure in the tank, while the motor is dependent on pressure build up in the tank from the motor to stay running, and that comes back to the tank on the 2nd line once the motor starts. When the motor quits, if you loosen the tank cap can you hear pressure bleeding off?

You may have an air leak in one line or the other – most common place is the gas line connector where the internal O-rings get hard with age and don’t seal…or the tank diaphragm and /or gasket may leak.
Dave

test tank pressure by releasing the fuel cap it should go Pssst! if air pressure did build up .

you may also consider converting to pump instead of dual hose system …easy conversion to do .

https://www.youtube.com/watch?v=FtG4M7ye1N8

did you pull the flywheel to check for cracked coils

• This reply was modified 4 years, 1 month ago by crosbyman.
• This reply was modified 4 years, 1 month ago by crosbyman.

In addition to an air leak somewhere, you may have carb problems. It shouldn’t flood when you pump the primer button unless you really force it hard.
Dave

OK, well it looks as if you rebuilt the carb, did you replace the float and float valve? You mention that the engine seems to flood if you continue to pump the tank primer….Looks like you replaced the fuel/air lines on the engine as well….Is it possible you reversed the lines on the engine? If so, you are pumping fuel directly into the intake manifold. One of those pictures you posted shows cracked coils, have they since been replaced? The engine won’t run very well with those coils….