So, last week I ordered the SEK - 4A and SEK - 5A propane conversion kits from Century Fuel Products.
http://www.usgemini.com/Generator-Conversion-Kit.html
$240 for everything.
They arrived today, and after about a half an hour positioning everything and making up fittings, and another half hour or 45 minutes to install, and the generator is up and running on propane power.
5000 watts of heaters and 250 watts of halogen light.
The low pressure demand regulator. The large set screw with lock nut at the top is the demand needle valve. You manually set this for optimum run at peak load and then lock it in place. The empty set screw sockets on the top of the rail are for the gasoline tank, which is removable on this model. These two holes required drilling through the frame.
This is not the best shot of this, if anybody is really curious, let me know and I'll take a better picture. What you are looking at is the "injector block", basically a circular jet ring, milled out of aluminum, that bolts directly ahead of the stock carb with extension studs.
This was the only problem that I ran into, these extension studs were threaded metric and I needed 1/4" x 20. No worries, a few minutes with a tap and die had them ready to go.
The low pressure gas from the demand regulator is fed in here. Important to note is that all of the stock gasoline carb equipment is still in place. I have the tank removed for ease of work and clarity, but all that has to happen is to bolt the tank back on and hook up the fuel line to run regular gas. All the original carb parts, choke and air filter stay in place and will function normally.
Another view of the demand regulator. The kit came with black iron closed nipples, elbows and a brass ball valve to make a shut off connection at this point, but I connected the line from the tank regulator directly to the demand regulator to cut down on weight, connections that might leak and things to get hung up on. Since it was going directly to the portable tank with a shut off valve three feet away, I didn't see the need unless I hook it up to the low pressure feed line off my 100 gallon propane tank. I don't anticipate using that unless $#@! really hits the fan.
So far, runs like a champ, and now I can store emergency generator fuel without having to worry about it going bad in three months like the gasoline will nowadays.
I highly recommend this kit.
Post in the thread if you have any questions, I'll try to answer them
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