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Obviously, fueling a propane race car in the pits is a bit more complicated than its gasoline cousins, so Roush had to fabricate a couple of these carts, from which the car can either be fueled or drained of fuel, if necessary, using the transfer pump. The cart tank holds about 20 gallons of liquid propane-certainly more than enough for a race weekend. Guess they can power the crew's barbecue, too. On a related note, a similar setup had to be created just to fuel the engines while they were undergoing testing on Roush's brake dyno.