John

You want the vibrator type for glow fuel generally on the 4 strokes. People have been able to get the other crankcase tap type to work via some tricks with the crankcase vent on four strokes but that's a iffy thing.

The Iron Bay type regulator needs some way to make enough pressure to force the fuel up behind it so people have used a check valve in the muffler tap but that's iffy also.

Show us some pictures of your scale models again sometime?

Enjoy,

Jim