I received a L F-3 style engine, and the instructions read to add smoke fluid to either, but not both of the 2 openings on the engine. Suppose I forgot which opening I added fluid, what's the solution? thanks
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Try to remember to mark down which stack got the fluid and when the smoke weakens, fill the other stack and mark this down.
Alternate your stacks.
I'm not sure of these newer locomotives, regardless of the stacks, if there is only one, or two smoke heating elements? If, one, then no problem, but two, then at various times you want to keep the elements somewhat moist, to prevent burnouts.
Check your manual to find out how many heating elements are in your unit.
Ralph
Super"O" man; You have NO dilemma here to worry about. The F-3's use a "gang-style" funnel between the two stacks that funnel the fluid to a central exit point that enters into the smoke unit itself.
Lionel is just covering their bases, so to speak, so that two separate streams of fluid are not trying to simultaneously enter the smoke unit at the same time.
I would recommend you give the stack you put the fluid in a small "puff" of air to clear any bubbles that may be in the filling system after you add fluid.
Happy smoking....!
The smoke opening at the rear of the engine has the shortest path to the opening of the smoke unit. I would also suggest that you fill the unit with a needle point bottle and not an eye dropper type. 
Originally Posted by Stephen C. Puntar:
The smoke opening at the rear of the engine has the shortest path to the opening of the smoke unit. I would also suggest that you fill the unit with a needle point bottle and not an eye dropper type.
Ill second that, with a gentle blow down the stacks mentioned above. I usually try to do a "night before" fill, to give the fluid a chace to get down to the wicking.
