Most of the fuel-air tubes have a round opening for the air inlet. Like in this image from OCP: Yours have a slot instead, Juan. Interesting. Just wondering if that could be a little too enlarged. If it is, you might try to partially block it or stuff some brass gauze for air flow reduction, between the slot and the inner tube in case you couldn't find any faults in the inner tube. Just a thought.
Could have missed something but I would clean it very well the take that spring in the F/A tube and stretch it slightly. There is one other thing to think about: there is a tube that comes off the pump barrel and "snakes" to the top part of the tank. That tube, over time, can be partly clogged. They can be a real PITA to free up! If this tube is partially clogged you should meet some resistence when you try to pump it.
Everything is clean, the spring has good strength, etc. The only thing I'm not sure if the inner tube is sealed at the top. I could see it is screwed on the external tube but I still can't guess how to remove or to tighten.
Could you find any defects or leaks in the inner tube? I hope it has not been somehow shortened prevìously. If the inner tube has been cut short, you'll get the same effect as what you're getting. If its threaded and not soldered, you'd be able to remove it. If it seems too tight, you might heat-quench it a little to loosen up the threads. Make sure that you remove the rod and spring first before you try this or the spring would loose its temper once heated. But if the inner tube is not really defective, don't attempt that or you'll risk damaging it.
Juan, if you happen to have a spare fuel-air pick up tube, you might to try swapping that to see if the problem persists.
Well, the 220 has the same problem. I just blocked the air port and the lantern works fine ... obviously no quick start ...
Seems you'll need to sort it out somehow..someday. The quickstart feature's still missing. I think the inner tube has been soldered (at least on some) and not removable simply by unscrewing.
