They are the solution to bad gas. I have one and bought it after spending all kinds of
money keeping my Yamaha 4HP
4 stroke running. I had a little initial problem getting it tuned right, but after that it starts in the first or second pull. I drilled a hole in the side of my plastic cowling to access the bleed valve and keep a large paper clip with me. Every time I use it, I put the paper clip in the bleed valve hole, slightly press, and that bleeds the air from the line. That works for the can of
propane until change if I m using regularly. If I put it up or change the propane, I just rebleed and start again. That gets the propane fully in the line and it is ready to go. I run at about half throttle as that pushes my air floor
Avon 280
dinghy at about 4 knots with two of us and it will burn about 45 minutes to an hour per 1lb can of propane. I keep spare propane in a 4inch pvc tube with a cap on one end and a clean out fitting on the other and I can open the clean out when I need a new can of
fuel.
I’d never go,back to,gas unless we go back to gas without the additives like we used in 2004 when I bought the Yamaha. Worked great for several years, then could hardly keep it running.