About a week ago the truck started being a little difficult to start. I would try to start and have to give it a second set of cranks to get it to fire. Previously to this it would start almost instantly. No I don't have my fuel pressure gauge installed yet but do have a low pressure light on a Hobbs switch mounted on the VP. When I have difficulty starting I'm seeing the light come on a little and flicker. Never experienced that before. If I reved the motor up to 1200+ rpm pressure would stabilize. Now I don't see any visible signs of a fuel / air leak. I changed the fuel filter to see if that would help. It didn't look bad and made no difference. I know I need to get my gauge installed (waiting on the moldex plug that wasn't on the gauge when it was shipped) to really see what the fuel pressure is doing,but it does seem that I'm loosing prime? Any suggestions?

Well on the bright side the Hobbs switch is most likely beat up from the water hammer and flickering now. My first Cummins pressure switch did that and one day it just started peeing out the top of the pressure switch... Now as for getting a gauge on there is important to see what your run pressure and starting pressure is. Remember excessive pressure at start up time might cause issues... Then low pressure during run might of ripped the diaphram and made matter worse.