Why Won’t My 95 Chevy Suburban Start Back Up

I have a 95 Chevy Suburban. Thought it was fuel problem, I took my fuel tank down and cleaned it. i blew my fuel lines, replace oil pressure switch, replaced both fuel pumps, fuel lines, fuel filter and fuel pump relay. I have good fuel flow all the way up to the Injector pump. however truck will not start. I can get it to start by putting fuel in the breather, but turns off as though it is not getting fuel. Prior to it turning not starting, we were haveing stalling problems. Now It will start run for 5 minutes turn off and then not turn back on for half and hour or so. PLEASE HELP ME.
Let me add details that I forgot to add….I have a 6.5 Turbo Diesel engine

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  1. James S
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