3000W Chinese Gensets Info.

Explorer

Dec 05, 2012

kirkadie wrote:
Thanks mrekim and prof.
I'll have to be patient and wait another hour or so for those west coasters to wake up before I can order it. Carb model is a bit different, but was in the manual.
Sorry if I ask perhaps a stupid question, especially after announcing on my first post that I'd try to keep quiet, BUT, what's the reason why I can't remove the main and idle jets and then connect the lp hose directly to the gasoline supply on the carb? Since the lp is already a vapor would it not fill the cavity (float bowl, etc) and still be pushed into the venturi at the same rate as the 'tube thru drilled out main jet oriface'...

thanks again,

Kirk

Never a stupid question (only stupid answers)

It has been tried and did not work - even with removal of the float, needle and main jet. Apparently the needed size of the venturi tube and position withing the carb are not adequate for LPG. There have been some "jury rigged" jobs where a high pressure 14 oz disposable container and part of a propane torch have been used to feed LPG to a gas engine. Personally, even if it works I find it scary and potentially a scenario for a nice explosion.

Using LPG for fuel on our generators assumes a constant engine running speed. There is NO provision for supplying fuel from idle to 3,600 rpm unless the output from the Impco regulator is split with a T and fed to individual load blocks. The load block outputs are fed to BOTH a feed block behind the carburetor and another one in front. Demand shifts as the throttle plate moves. Salvo built such an arrangement for his Yamaha inverter when we were exploring feed blocks on this thread.

Personally - I would NOT drill a carburetor for LPG unless I knew there would never be a need for gasoline switch-over without having to replace the carburetor.. (yes - I did it but it is no longer in use) Making the feed block that attached to the front of the carburetor allows both LPG or gasoline as a fuel and is totally non-invasive and easily reversed. It is all back there in the archives. I may still have some photos on the computer if needed.

The Garretson/Impco/Woodard (pick a brand - all OK) demand regulator is an absolute must as is the load block to adjust feed. You absolutely must buy the regulator.
The rest you can make or borrow from an old gas grill.

There is one exception. There is a "mixer" strictly for LPG that has ALL of the needed components built into a device slightly larger than the carburetor. Attach a BB-Q regulator to the tank and run it to the mixer - you are done. Yes, I have one and it works great (not currently installed). The only problem is finding one to buy - for some reason they are rare.

This is a commercial propane carburetor knows as a "Mixer:
This photo showes a fuel feed block that goes on the front of the carburetor. A commercial 1/2" ball valve is being used as a load block.