I received several emails about this whole vegetable oil thing for diesel trucks. From the corrections department, yes you can use vegetable oil legally on the public roads. You have to pay the fuel taxes to do so legally. You can even purchase the oil that has been filtered and has the fuel taxes included in the price.
I've also discovered that American Tank has been selling these fuel systems for ten years. They are not in the catalog or listed on the web site. It makes one wonder what marketing genius came up with the idea of keeping your product a secret as a sales tool. Here is some information about one of their systems:

Enhance the appearance and usability of your vehicle while saving a little money with an auxiliary vegetable oil fuel system from American Tank. Vegetable oil can be used as fuel for diesel powered trucks if you use the proper oil that has been properly filtered. You must use 98% non hydrogenated oil that has never been used to fry meat. The oil should not have been used to fry battered foods. The oil most be processed to remove any solid wastes, water, and any hydrogenated oil. Your WVO, SVO, or bio diesel fuel system will need a heater mounted inside the auxiliary tank to heat the oil so that it can flow through the fuel system.
American's auxiliary fuel tanks are constructed of .125 inch 3003 marine grade diamond plate aluminum with a brightly polished finish. This vegetable oil tank features a built in Hot Fox fuel heater and sending unit that will display the fuel level on the factory installed fuel gauge. Fuel slosh and engine starvation are never a problem due to our unique triple baffle system that is built into every tank we sell. Most of our auxiliary fuel tanks do not exceed 19 tall, so as not to interfere with fifth wheel or gooseneck trailers. This tank measures 57” across the bed, is only 12” wide to use a minimal amount of bed space, and has an overall height of 18”.
Don't settle for an inferior quality tank that is designed for fuel storage, or a so-called auxiliary tank that is not offered with an installation kit. This is a complete WVO, SVO, or bio diesel fuel system. Priced here with installation kit, your auxiliary fuel tank will ship pre-assembled for easy installation by the average do-it-yourselfer. Price does not include shipping and handling charges.
This kit includes:
- 40 Gallon Auxiliary Fuel Tank
- Hot Fox Heater
- Fuel Level Sending Unit
- Vent Valve
- Raycore 300RC Filter
- Fuel Tank Selector Valve
- Wire Harness
- Fuel Hose and Clamps
- Insulation For Fuel Hose
- Heater Hose and Clamps
- Fittings and Mounting Hardware
- Easy To Use Installation Instructions
This fuel system can be installed on any ¾ or one ton Ford or Chevy diesel truck to 2007,and Dodge diesels to 2003 that do not require an in tank fuel pump. Specify what year and make of vehicle you have when ordering so that we can include the correct installation kit. Please feel free to contact us about other applications. We can be contacted toll free at 877-485-3359, www.auxtank.com.
Mention that you saw their ad on The Custom Trucks Network.