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Glad too hear your on the right track with your problem. post some pics when you get in the field

Never thought of the hand primer could be. I haven't worked on those style injectors in a while My 400's have top stops there 6 inch pounds. beside the point. I would check the hand primer and tank selector valve beside seat. My recent experience was with a big cam 400 that I bought out of a...

Should be full. I would say air leak is your problem. Maybe the tank selector valve. I have seen so much as a loose fuel filter suck air and make them run bad. Your valves too tight will cause white smoke also. I think its 72 inch pounds on the injectors and .14 and .24 on valves. Not sure on that.

Yes sir. If you rev it up does it blow a big cloud of smoke and miss some might even snort and pop, then cleans up and run right.

Faulty injectors will cause that, and so will a air leak in the supply line on a cummins. a small air leak will make a cummins do all sorts of things like smoke white, miss and slopper in the exhaust.