How to Use Magnets on Your Automobile's Fuel Line

Internal combustion engines power most automobiles on the road today. This engine mixes gasoline and air in the combustion chamber and ignites the resulting mixture. The energy released in that controlled explosion drives the pistons, turning the crankshaft and moving the car.
The efficiency of the internal combustion engine, however, is almost embarrassingly small, and MPG ratings of 20 miles to the gallon are not unusual. In an effort to obtain better mileage, many people suggest mounting magnets to the fuel line in order to affect the way the fuel burns. It is commonly suggested that the magnets ionize the fuel, leading it to burn faster and more completely.

Things You'll Need

  • One or more permanent magnets
  • Compass
  • Duct tape
  • Locate a suitable place to mount the magnets to your fuel line. They must go between the fuel pump and the carburetor or fuel injectors. The closer you can mount them to the combustion chamber, the better.

  • Determine each magnet's polarity by holding a compass to each side of the magnet. If the north side of the compass needle points to the magnet, that is the south pole of the magnet. Likewise, if the south side of the compass needle points to the magnet, that is the north magnet pole. Mark the poles with a permanent marker for easy identification.

  • Place the magnets against the fuel line, one on each side, with the south pole against the fuel line.

  • With the magnets in place, wrap them with duct tape to hold them to the fuel line.