56picup,

The heated water not only helps with start-up but seems to be needed during normal running. As I recall (and I hope this is not "mumbo jumbo"), when the gas vaporizes during carburetion, there is a significant temperature drop that cools the intake manifold and could result in condensation of the vaporized gas. A heated manifold prevents this condensation.

I trust that someone will either correct me or clarify my recollection.

Tim