Fuel, spark, and a relatively sealed place for combustion to happen are the three basic necessities for running any engine. You'll also want oil and coolant to keep the thing running. The water pump and radiator were loose in the pickup bed, the thermostat was missing, and mud-wasp nests completely clogged the water pump in our truck. Fearing the block's water passages might also be obstructed, we stopped at a car wash as we hauled the Dodge home. We blew high-pressure water through the water passages of the block, alternating it through the intake and outlet holes until only clear water flowed out.