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Glenn, I've actually seen one truck running on used cooking oil. However, there's a whole lot more to the story. The guy collects the oil by hand-pumping it from a nasty barrel at a fast-food place into a big barrel that he hauls around in the back of his pickup. He then takes it home and drains it into a tank where he lets it sit for a couple of days to separate the solids from the oil. He then pumps the relatively clean oil off the top of the tank into another tank that is elevated. He lets it run out of the elevated tank into another tank through a filter that he has in the hose. He then pumps it into a second fuel tank that he has on the back of his pickup. He starts the engine of his pickup with diesel fuel and after the engine gets up to temperature, he switches over to cooking oil. To do that, of course, he has to have the second fuel tank in the back of his pickup, a second fuel line running to the front of the truck, a second fuel filter in the second line, an electrically operated valve that switches from the diesel fuel line to the cooking oil fuel line, and a switch in the cab to operate the valve. About every third or fourth load of oil that he brings home from the local restaurant, he has to scoop out the solid sludge from the settling tank and dispose of it at the landfill. This guy is a "gadget-guy" so it's great for him, but there's no way I'd want to mess around with the whole thing. Good luck, Tom in TN
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