So I guess the only wrinkle that occurred to me last night was that the particular engine is a RailKing RS1. The smoke unit is not directly under the stack so there is a shunt or conduit that runs under the top of the shell from the bottom of the smoke stack to the smoke unit. I'm just wondering how at all this might impact or affect the way that you should add smoke fluid to the unit since you can't get straight down to the reservoir even with a needle point applicator. It would seem to me that the shunt makes it more likely that smoke fluid could wind up causing a vapor lock since it runs more horizontally from the stack to the smoke unit albeit at an angle. I'm just wondering if this was part of the problem since I have many PS2 & PS3 engines and have not had this kind of trouble previously.......
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