Last week I could buy this Optimus 300 pressure lamp. ( gasoline) It needed attention. I cleaned the tank in an ultrsonic bath and cleaned and inspected all the seals. The lamp does well ...after a good rub the shine is nice with some patina..the copper underlayer for the chrome can be seen in some places. The glass was broken. For this time I have put a glass in with no mark on. The top vent cap needs to be replaced. This one is still gonna be a search to find. The tank is close , so that is good. An under water test made this clear. The leater for the pump I replaced it for now with a leather from a petromax...that leather is a bit too big I think but I will order a kit for this lamp that I could find online but is not cheap. Fot the whole thing...after the work I have done this is a nice lamp.
Nice find. The 300B is not that common. The one I have has had a kerosene jet fitted and runs on kerosene. I'm not a fan of the pump not having a positive shut-off when using petrol/gasoline. The top from any mid 1930s 300 will fit.
Yes they look good. Not cheap. I was wandering if I install a jet with a curl ( I have one from a Radius 108) should I be able then to burn kerosine instead of gasoline?
@ Nils...but when I release the pressure of the tank the lamp will go out in an instant like all pressure lamps or I misunderstand what you mean by positive shut off..
What I mean is that the valve in the pump tube (the non return valve NRV) is all that stops the fuel from coming out. On other petrol fueled lamps like Coleman, there is a mechanical way of closing the valve after pumping. A much safer design when using the more volatile fuel. The 300B is designed with the extra valve, so this is how the lamp is meant to be turned off. Just the right thing for petrol/gasoline. If using kerosene, then the lamp can be turned off by releasing pressure.
