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I changed the two fuel filters, one at a time and on the 8V92TA Detroit  and filled them with diese before installing them. This is the 8th time in eight years that I have done this with no problems. Well the 9th time is an issue. Strarted the coach up. Ran for about 30 seconds perfectly, no leaks. Then it started running rough, like 1 cylinder was not contributing.  I was unable to raisse the rpm's and shut the motor down. Removed the first filter, looking for perhaps a double gasket situation, but all was good. Same with the 2nd filter. Replaced them one at a time with spare filters, filling the filters with diesel. Now the coach is still a no start. Never had to purge air. I don'tknow how to proceed. Iam avoiding cranking for long periods, trying to avoid damaging the starter with heat. Any suggestions?

Not sure if your bus has the hand primer pump on the fuel tank, but if it does you could try pumping that. Some Newell's have a primer on the fuel filter housing, should look like a black button. 

One other thing that I like to do is always start and run the engine for a few minutes before you change fuel filters. This gets the engine hot and makes it easier to start since you are not fighting a cold start on top of air in the fuel. 

My way to get the air out is to use my milwaukee vacuum with the hose on the blow side and I put it into the fuel tank with a rag wrapped around it. It does not have to be a perfect seal and there is a vent on the tank so some of the air is going to go out the vent on the tank. I usually do this with two people so one can hold the vacuum hose on the tank and then you can unscrew one of the fuel filters until fuel starts to come out of it. Once you have fuel coming out the filter put it on tight and let the vacuum continue to run. I usually try to start it while I still have the vacuum blowing into the fuel tank to try to get the fuel into the fuel pump. Detroit fuel pumps are very hard to prime when there is air in them, they do not pull air hardly at all.

Another note I will mention, if this is on the 84 Newell you may want to look into replacing fuel lines if you have not already. The fuel lines could be sucking air and not helping the situation. They hoses tend to not leak fuel but can suck air so its often overlooked.