Digital BW, The Print

I'm printing away while desperately needed fresh inks are in transit. A
couple of my CIS bottles are out of ink, but there is still ink in the tubes
and the cartridges. When the inks do arrive do I need to do anything special
to try to force the air through the cartridge, or should I just add the new
ink and start printing?

I'm hoping perhaps the sponge in the cartridge somehow allows air to
disperse with ink before it exits the port, making air in the system less
than critical. Am I sadly naive?

Todd