[/B][/B]My 2003 is giving me fits when the temp drops outside. It has always been a little slow to start, but now will not start when temp below 40. Grid heater is working good(burnt my hand on manifold after cycling a few times). Lift pump sounds strong. Truck runs well after start. The fuel heater has 11 volts to it. I cannot tell if it is getting warm, but should it matter at 40deg? The fuel does not gel until lower. Could it be the fuel control actuator not opening properly. I have replaced the lift pump with new one from cummins last spring. I can plug it in and let it warm up for 10 minutes and it starts fine. Fuel filters were replaced right off the bat. Old one looked clean.

As a side note could overdue valve adjustments make it harder to start?

Is there a thermostat on the fuel heater? I see the connection below the heater that I believe is the water in fuel.

Hope my questions don't jump around too much. This is frustrating.

I edited this request because I have not gotten any replies. Someone must have an idea about the fuel heater thermostat and the other questions????