On Mon, 08 Jan 2018 22:48:11 -0500, wrote:

No, it installs between the carb and the aircleaner - about the
simplest installation you could immagine, as it's only 2/16 to 1/4
inch thick.

Mine is between the carb and the manifold. Gas doesn't flow until it
feels vacuum and you use a primer button to kick it off.
I am not sure about the claim that it produces less power but it
certainly uses more fuel to compensate for the energy in the propane.
I was using a convection oven as a load pulling over 23a (on a 5500w
generator at 230v) and I did not any difference at all between
gasoline and propane running pretty much at the full rated power.
The fuel consumption is a ratio of around 5 to 8+ tho.

Correction, you are right, it is between the carb and the air cleaner.