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Thanks for all the suggestions. Here is what I am dealing with. The fuel water seperator is a very obsolete one designed for the genny and the 8V92TA. It is mid coach nest to the fuel tanks. The engine bay has a primary and secondary fuel filter. Earlier today we applied posittive air pressure to the puel taks with a rag and reversed shop vac, Got  little white and then a puff of black smoke, but no fire. Only did it for 30 second intervals. Then waited 10 minutes between tries. Didn't want to overheat the starter.

In your photo it appears there is possibly a fuel pump and a switch (circled in red)? Do you know what those are for? Maybe they are there to prime the fuel system?