At 15:20 Stations 107(Turkeytown), 17(Smithton) and 19(Yukon) were activated for a vehicle accident involving two tractor trailer trucks on Fitz Henry Road near the Flying-J Truck Stop.  Medic Units from Station 500(Rostraver / West Newton EMS) arrived to find one patient still inside the vehicle, unconscious but not entrapped.  Attack 17 arrived a short time later to assist with patient care and attempted to contain a major diesel fuel leak coming from one of the trucks.  Units from 107 and 19 arrived to assist with the fuel leak and clean up while Engine 17 responded to set up a landing zone at the Smithton Truck Stop.  Command 107 requested a Truck service company to assist with the clean up and notified the DEP due to fuel getting in to the drainage system.  All 17 units cleared in approx 1 hour.