Here is the veggie oil tank. The thing on the left with the red hose coming out of it is the Arctic Fox. That sticks down into the tank. As you can see, there are also two black hoses connected to the Fox. These are Coolant in and out of the device. That's how it heats the veggie oil in the tank.

The white pipe coming up out of the tank is the fill pipe from the gas cap.

The small black hose that connects on the right is the Return from the engine.