I'm glad to have joined the pressure lamp family. I recently purchased a coleman 220k that hasn't been used in quite some time. When I got it home I fired it up. All was well besides the pulsing and yellow flame. So I tore it down to the fount and didn't notice anything unusual but I didn't inspect or clean the burner assembly. I put a new generator on it and that seems to have resolved the pulsing issue but it still burns yellow. Any recommendations on what I should do to solve this?
Welcome, @ClintonMurders! I think you gave the answer in your question. Inspect and clean the burner assembly, particularly the air tube, mixing gallery and also the burner tubes. Any partial obstruction there will cause the symptoms you describe. Brush out with a nylon rifle brush, compressed air alone is not sufficient. Cobwebs, mud dauber nests, etc. are often found in lamps that were unused for a while .
Haha, I realized I should have been more thorough. I ended up taking it down to fount, cleaning the burners and a new generator. I inspected the fount and noticed a red lining inside that was flaking. So I poured some vinegar in it, shook it and let it sit a bit then emptied it. Afterwards I kept refilling the fount with water and draining until no more red flakes appeared. Reassembled and lit it. No more pulsing or dim yellow light, albeit the light is still somewhat yellow but I figure it's due to the new produced coleman mantles.
The new Coleman mantles do indeed produce a slightly yellow color. Once in a while you can find some new old stock Coleman mantles which will produce a very nice white light, but these mantles are getting very hard to find and are getting expensive.
I picked up some peerless mantles but I'm having trouble figuring out if they're thorium. I put them on my propane lantern and wow it's bright.