Sounds like you have to much fuel flow. First thing I would check, is to see how much "black sewage" is in your regulator. To much of it will cause the diaphragm to stick open and cause to much fuel flow. There is a drain bolt (or valve) located on the bottom of the regulator. If it is the bolt style it will have a 12mm head and be quite short. Don't loose it. Remove that and let all the perfin drain out then retry to start truck.