Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Thanks Swift Fox for your prompt and informative reply.
Of course there are 3 pipes on the little tank not 4 as I said. I can see how it works now and I will get it running soon and let you know how it runs. That tank with the chimney fitting must have been an optional extra as there is no space for it on the factory wooden base.

One more question, regarding the gas tank connections. There is the filler, the outlet including pressure control, and another connector with a white collar and a chrome cap nut. Is that white connector a prv ?
Some pictures I have seen have mini glass oilers on the engine. Are you using these or just oiling the bearings as required?   
Regards Brian