This is baffling to me maybe one of you can shed some light. I have a 2001 3500 24v Cummins that I just replaced the IP pump on and now the darn thing will not start. I did everything right installing it and bleeding wise to get it to start. For example, I cracked #1 & #2 injector lines at the block while priming, but really only got a dribble of fuel coming out. I even tried giving it a shot of starting fluid with the two lines open to get the air out and still just a dribble of fuel. So I double checked that there is good fuel to the IP pump by cracking the elbow and it flows great. I am stumped. I have another 2001 3500 and we have replaced IP's before in the past and never ran into this problem. It was always simple with maybe a sniff of starting fluid to get it to run. (I use a shot of that because I don't have the heater grids no longer.) I am at wits end with this thing, any suggestions? Thanks!

If I had to guess it is like the all the IP's are not switching from low volume to high volume to pop the injectors, but all 3?? When I say dribble I mean when I crack the lines the fuel coming out is minimal. It should shoot out a lot harder. Anyhow does this make sense or am I chasing my tail?[dummy][coffee]

I have done the following to eliminate a few possibilities.
-have 3/4 tank of fuel
-replaced the IP pump 3 times
-replaced the airdog 165
-changed fuel filters
-checked fuel pressure to the IP and its 18 PSI according to the gauge.
-replaced the ecu
-replaced the pcm
-changed and made sure the batteries are at or over 12v.
-tried spraying a sniff of starting fluid, no go.
-checked the connection to the IP pump, its good
-battery terminals new and cleaned
-Key way on the IP install was in the right place.
-only codes that came up was: P00122 throttle position sensor low circuit
P00237 turbo charger boost sensor A circuit low