LPG Freezing troubles

Where did you get it? My nautique runs an automotive stat whixch I just matched for size at the local motor factors. Runs between 140-160 all day long.

Remove the stat and check for debris holding it open. I ran up some shallow water this year, sucked up some shell debris which held the stat open a smidge. A couple of mm gap was all it took to take the running tamp down to 90 degrees.

LPG freezing is usually down to poor water flow.
Check your scupper, water strainer and trans cooler for blockages.
Check your raw water pump impeller for wear.
Also check all your water lines for air leaks. It only takes a small amount of air to be drain in to cause problems.

A correctly installed system on a ford should exit from the inlet manifold and return to the circulating water pump.

Also check your engine temp is sitting at around 140, a stuck open thermostat will cause additional freezing/rich running issues especially if you have any of the above issues causing poor water flow.

The Ford engines have very good water flow at idle and above speeds. GM engines do have issues with water flow at idle and these can cause freezing of the vaporiser at low speeds (especially if a heater has been fitted).

I've run LPG boats for 20+ years even trough the winter with lake temps only just above freezing without any issues. I've also installed, serviced and trouble shooted many systems so if you still have problems after checking the above coem back to me.

Fly,
What is the guy saying that did the conversion?

It sounds like the water is draining back to a lower point when the engine isn't running. Then, when running the water is flowing through the circuit with the least resistance. (the original plumbing circuit) The "Y" idea may help but I'd look at plumbing it using a series circuit instead of a parallel circuit. IE: Get rid of the "T" and go through the vaporizer first and then through the original circuit.

I know nothing, but if you can't get it figured out probably this guy can help you: http://www.riversidewakeboarding.nl/. He does LPG conversions.