Hello: I have a 2004 Thomas SchoolBus with a 5.9 cummins diesel engine and I am having some issues with it. Anytime day or night when it hasn't been run for about 3 to 6 hrs, it doesn't want to crank up. So we ran our little diagnostic tests and it came up with nothing. So we went and bought us a new Fuel Transfer Pump for it, we changed it out and it still doesn't want to crank. You have to go through the timer phase about 10 to 15 times before it cranks. Can anyone outh there give me a clue as to what my problrm may be? I would greatly appreciate it.