hello all! this is my first post for help. i am having problems getting the d to start after driving for a hour + when i stop for an hour or more it will turn over but will not start. i have tried jumping the rpm relay to send power to the fuel pump but that did not help when i leave the d for more than 8 hours, it will start ? (really rough like it needs a tune up--just replaced the accumulator and had a tune up 3 mo ago) i have checked the nuts on top of the fuel pump and they appear ok---any suggestions thanks delor1@xxxx