Hi just put in a reman long block into machine. Starts rough and smokes like crazy, low and high idle. Double and triple checked injection pump timing, valve lash, injectors are good.I have a new mechanical gauge attached to the hose off the side of injection pump, When using the hand primer pump (which don’t leak when using) I get some pressure 15psi it drops to 0 in a matter of two mins, I’m confused when I look up a check valve it shows me the hand pump, also when running fuel pressure around 26psi you can use the hand pump and still smokes, also when running started cracking injection lines and still smoked a lot and ran rougher. I’m at a lost now what to check?