the veg oil system is a completely independent 2nd fuel system. i start on diesel, and get the engine up to temp (190F). this coolant (in this case its a WARMANT), is flowing through the veg oil system and provides a heated tank fuel pick up, a heated line (aluminum fuel line inside a rubber coolant hose), heat exchanger, and heated fuel filter. this allows the veg oil to get to 190F and injects and a meters like diesel. when i park for the night you need to go back to diesel, and purge the engine and injectors of veg and go back to diesel.