The electric choke may be out of whack or cross wired if it is open when the motor is cold turn on the key and watch the choke. If it is wired wrong it will close within about 2 min. My thoughts on this are many and we will need more info to diagnose but I would check the choke first. Although I don't think it would make the motor die just run poorly. I believe you have some other issue. You said the tanks have been drained a couple of times and you found junk in them both times. Take off the fuel filter and look at it and the gas that comes out of it see if there is any junk in it, if there is a lot of sediment you may have to flush those tanks a few times. Does this only happen to one motor if so do you have the ability to draw fuel from one tank only? Try drawing fuel from the tank where the motor keeps running and see what happens. If that fixes it you have an issue with the tank or the pickup tube or the fuel line from the tank to the crossover. That would be my first test after checking the filter as it is easy to do.
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