The FuelSaver is designed for Diesel fuel applications including generators, marine diesels, and heavy equipment. It also works with fuel oil (boilers, for example). It is neither intended nor feasible for smaller applications such as automobiles and smaller engines.
Typical Installation
The FuelSaver is typically installed after the fuel filter, and on the fuel return line. In this way, the fuel circulates through the device many times before it is combusted.
This is an example of how the FuelSaver is installed on most diesel systems: