This DIY waste vegetable oil conversion is based around three simple points which are outlined below.

1. At 160° Fahrenheit used vegetable oil will act the same in the injection system as diesel fuel.
2. The Vegetable oil must be filtered at least as well as the stock fuel system filters diesel and the filters should be large and easy to replace.
3. The motor must be shut down and started up on diesel (or biodiesel).

After working with the grease system and talking to other people who had converted it became apparent that looping the fuel return was the only way reliably heat the grease to 160°. If the fuel return is not looped back to the input of the injection pump you will never maintain the required 160° minimum temperature inside the fuel system.

For details on specific stages of the conversion check out the Conversion section on the left, or the links at the top of the page.

Before:	After: