Photo of a Carburetor Dedicated to Alternate Fuel

The most common method of conversion is the type that changes over the carburetor. This method is less expensive because the original gasoline carburetor is modified to meter the alternate fuel.

To make the modification, simply remove the carburetor from the engine. Unscrew the float bowl and discard it along with the float, needle and high speed jet that runs up through the center of the carburetor (shown below).  The passage that the high speed jet ran up through is then enlarged to accept the new propane or natural gas jet. One other passage is drilled larger and all other passages are sealed with the sealant provided. That is basically it. An example of the new tube can be seen in the picture above.

This type of conversion will produce FULL power because the carburetor is now delivering fuel at the exact location that was engineered for the delivery of gasoline to the engine air stream. Even though most people never go back to gasoline, if gasoline operation is ever wanted in the future, a new carburetor would be purchased.

Click on the pictures above to some examples.