I have read about imploding fuel tanks. Cleaning the vent is on the list of things to do this weekend. I might just run it with the fuel tank cap off for now. I know the tank isn't imploded yet because I have all the trunk lining out to fix a rust hole in the passenger side wheel well and I can see the tank.

The crud in the filter is black. The old filter was completely blacked out, so I am expecting fungus/algae along with what ever other junk is in there.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge