Make Biodiesel!

Step 5 Prep the oil

Take a carboy filled with oil and connect a section of hose from the carboy to the intake valve on your processor.
Use hose clamps to secure the hose to the carboy lid with the ball valve on it. Be sure to have primed the pump.
Now open the valve on the carboy and the intake valve. Turn on the pump and make sure the glycerin drain and out-take valve are both closed, so oil doesn't come shooting out.
At this point it is very important to have the pressure vent on the processor open, this way you can leave the valve nearest the processor tank closed and let as much oil as you can be sucked though the intake point and get pumped into the tank. Also, be sure to have the vent on the back of the carboy open, or you'll create a vacuum and the carboy will implode.

Once all the oil is in the tank you can turn on the element. If you're using more than 5 gallons of oil you obviously will need to disconnect the hose and repeat more than once.

Heat the oil to 130 degrees F. (you can open the drain valve, get a quick sample, and use a quick-read thermometer to check. )