My friend has a 2000 ford f-350 with the 7.3 engine a in the coldest days of the winter the truck will only start if you do the following 1 crank the heck out of it 2 starting fuild but I told him that's not a good idea 3 pull in the block heater for two hours and it will start but you have too keep your foot on the gas pedal or will die sometimes in the summer months it will start fine soon as it gets cold yes you got it won't start but if you keep cranking it the oil preasure gauge goes up and it will soon takes off got any answers on this