How to Convert a Coleman Powermate 6250 Generator to a Propane Home Generator
The Coleman Powermate 6250 class of generators are portable and, as the name implies, are 6,250-watt machines at full capacity. The generator is normally gasoline-powered, but owners who are interested in cleaner energy can convert the Powermate to propane or natural gas fuel. The simplest way to do so is to purchase a conversion kit that alters the stock carburetor, but the handiest owners may be able to customize the carburetor themselves. Such a conversion also allows for longer run times and avoids the possibility of gasoline going bad over time.
Remove the carburetor from the engine by removing the screw or bolt holding it in place. Unscrew the float bowl from the carburetor by removing the screw or screws holding it in place. This will reveal the float and needle, which you can remove by hand along with the bowl. Remove the high-speed gas jet by pulling it out of the passage in the center of the carburetor by hand.
Enlarge the high-speed jet passage using a drill, if necessary, to accommodate the propane jet. Use a drill bit one size larger than the jet's diameter, to make room for the connecting tubing.
Install the propane jet by inserting it into the passage where the high-speed gas jet was located, and attach flexible gas tubing so it connects the end of the jet to the adjustment valve. Push each end of the tubing onto the appropriate connection, then apply sealant around each connection to ensure a tight fit with no leakage.
Connect the adjustment valve to the propane regulator with tubing, then install the emergency cutoff valve at the other end of the regulator, again using a short length of tubing to connect the appropriate ends. Apply sealant to the connections.
Run more tubing from the cutoff valve to the propane tank's output valve. Seal the end that connects to the cutoff valve.
- Various 6250 models and replacement parts may have different dimensions at their connection points. Try to match the diameters of the connections as much as possible to ensure a secure fit between the various parts and the tubing connecting them.
- Converting your generator likely voids the warranty.
Eric Strauss spent 12 years as a newspaper copy editor, eventually serving as a deputy business editor at "The Star-Ledger" in New Jersey before transitioning into academic communications. His byline has appeared in several newspapers and websites. Strauss holds a B.A. in creative writing/professional writing and recently earned an M.A. in English literature.