At what point do you know you pumped your Titan to full capacity?

[KaBoom]

Some have told me to pump until the pump bulb is rock hard and too rigid and resistance to more squeezing.

Others here have stated they pump until the bulb goes flat and stays flat.

Seems to me both could be right. One case is the reservoir goes empty, the other case the tubes get full.

[edjohn]

Rock hard just means you are not strong enough to squeeze more. You aren't done until the bulb flattens. And even then you are only out of fluid, not necessarily full capacity.