Hey everyone glad I found a forum that might be able to help. So to make a long story long. N14 525, came in for head gasket leaking. Block pitted. 25,000hrs on it. Log truck. Pulled motor and sent it out to get surfaced and line bored. Did the build and re-installed motor. Could not get the thing to start for the life of us. Gone through every diagnostic possible. Will not fire up unless you give it a little shot of ether. Then it runs like a top. No smoke no nothing. At cranking it wasn’t getting the minimum 25Psi of fuel pressure off the pump. So sent it out and got it rebuilt. Still only getting around 5psi. I believe the pump needs to be replaced with a new one but We also don’t want to throw 1000$ at it. Any help would be great. Anything.
not an N14 person but whenever the ISX does this, no-start conditions are almost always caused by low fuel pressure while cranking.
Try bypassing the ECM cooling plate.
Try running a fuel hose straight from a jerry can to the fuel filter inlet.
Check that none of the plugs or crossover pipes are leaking between the heads.
Measure the fuel inlet restriction at the fuel pump inlet.
Should've been cleared out when the pump was overhauled but check the fuel pump screen.
Sounds like it's losing prime
Or the fuel solenoid is sticking
Are you getting 5v at the fuel solenoid?
If so, i suggest replacing the fuel solenoid
Is it an celect or celect plus engine? Hook up insite, check to see if it is reading RPM while cranking, if is not then you have a timing sensor issue and the ecm does not know to fire the injectors. It’s not smoking like you say so you are not getting any fuel to the cylinders. There is also a check valve and screen on the outlet of the ecm cooling plate, pull that off and check for blockage. Also a strainer on the fuel pump that can be pulled and checked. Make sure your fuel solenoid is opening with key on.