Got a new plan....going to install dry and loose...run the primer and fill the primary, tighten the primary, and run the pump until fuel runs out of the loose secondary and tighten it down. How's this sound? It sure as he11 won't be any nastier than trying to install full filters on an MC9...that's a poor location for fuel filters.
I'm open to any ideas on this subject that may improve changing fuel filters. Perhaps this time won't be so bad.
If you can back your bus over some sort of drop-off, changing filters is much easier... they were designed to be done in a pit.
Another little modification that makes changing filters easier is the installation of a shut off valve on each side of the filter head -- simply shut off the valves, remove old filter, prime & install new filter, open valves. One tip... when you start the engine after changing filters, rev the engine to about 1800 rpm or so and hold it there. That higher rpm (and higher fuel pressure) will allow the engine to make it over a small loss of prime when it hits an air bubble. And having a valve on each side of the filter head makes sure that any air bubble will be a small one.
This modification has been standard on most -- if not all -- class 8 trucks with the DD engines for quite some time now. All of my Internationals had it, and most of the Freightliners I drove for other people had it too. Don't know why bus manufacturers never thought of it!