[speedygonzales]

If you put the hose you attached to the bleeder in a clear plastic bottle and immersed in brake fluid, you can pump away all you want. Just don't allow the fluid level in the reservoir to get too low before you refill it. This way you can get done fast and you don't need another person.

By keeping the end of the hose in fluid, you won't allow air to get back into the system before you tighten the bleeder.

Also, if your bleeding out old discolored fluid, when the clear fluid makes it to the bottle, you know you did the entire circuit from the reservoir to the bleeder.