CNG (methane) is produced...
CNG (methane) is produced naturally by livestock, humans, and landfills. If you have access to one of these energy producers, capture the gas and put it in your tank.
What is CNG?
Compressed natural gas is mostly methane (CH4), but when it gets to your house it also contains ethane, propane, nitrogen, helium, carbon dioxide, hydrogen, hydrogen sulfide, and water vapor. It is relatively safe since it does not cause cancer in humans or corrosion in fuel systems. Landfills, livestock manure, and the earth give off methane gas. Some companies capture it and then sell it.
 Finding a good location to...  Finding a good location to mount the CNG tank can be a big challenge. Carbon fiber or fiberglass-wrapped tanks like this one are nice because they are much lighter than conventional steel tanks. Lincoln Composites can supply you with a DOT-approved CNG tank. |  Here is a CNG regulator from...  Here is a CNG regulator from DeLuca Fuel Products. Its job is to control the flow of CNG from the tank to the engine. Changeable springs inside the top cover of the regulator tune the fumigation process. |  This picture is from Jeff...  This picture is from Jeff Dean's Chevy. He mounted the regulator inside the hood although others have found it easier to mount it next to the tank in the bed of the truck. This helps with cramped engine compartments and shortens the high-pressure hose coming from the tank. |
 Two hoses were connected from...  Two hoses were connected from the regulator to the air intake. Jeff was running a lot of CNG, so he thought he needed the extra capacity. Most find that one hose works well enough. |  British Thermal Units (BTU)...  British Thermal Units (BTU) measure the amount of energy it takes to raise the temperature of one pound of liquid water one degree Fahrenheit. Diesel fuel is a very dense energy source because of its large carbon chains. A vehicle powered solely by CNG would have to have huge fuel tanks if it wanted to go long distances. | |