Here's the tank in the trunk. This tank is slightly different than the Greasecar 'standard' tank in that it has the coolant ports on the right side. The coolant lines come out of the tank and down through the floor to the right of the tank.

The coolant lines bring warm engine coolant to the tank to heat the cooking oil in the tank. Unless you heat the oil, it's too thick to go through the injector pump and injector nozzles. So the engine is started with regular diesel and allowed to heat up (which takes 2 or 3 miles), and then I switch from diesel to the heated vegetable oil (aka VO)