I've had this 200A for a couple of years, but have not tried to fire it...
...until tonight!
The pump leather was still in good shape, but the cap gasket was shot and the rim of the filler hole was a little rough with crust. I tried several caps from other pieces until I found one that would seal up the rough surface.
I tied on a new (radioactive) Peerless mantle and burnt it down, poured in some fresh fuel, pumped it up and lit it off.
It first it didn't want to light, but I turned the lighting lever down and fuel started seeping out of the generator and the various plumbing connections at the top. What little flame I had ignited the whole mess into one giant fireball that almost scorched the ceiling. I turned it off and waited for the flames to die down.
Not wanting to give up, I gave it another shot, gingerly babying the lever and valve to keep it from flaming up. This time was better, but it still had some flames coming from the top.
After it warmed up a little I opened the valve as far as it would go and it started to clear up some more.
By now the house smells like coleman fumes and radioactive mantle smoke so I decide to take it outside.
The lantern is slowly waking up from its hibernation and is clearly exciting about being used again. I dribbled some fresh oil in the pump, gave it another two dozen pumps and left it outside to run through a half tank of fuel.
Turning it down to a low glow with the lighting lever. Thanks for the tip on the mantles, Andy!
45 mins later, and it's still going strong, no more fireballs.