As title states. As long as no player is present at spawn the public ender tank lava/water/sewage is next to useless. People are in a couple places already trying to pump lava out of the nether, which isn't the healthiest thing for a server.
My suggestion until this is figured out is to replace the BCL loader under spawn with the Railcraft Admin Worldspike that was there previously, since it didn't seem to have the disappearing chunk loader issue.
Also of note: people still have a BCL chunk balance of zero, including myself.