Brake issues

I recently bought a car that the ABS module
need to be replaced. We replace the module
and brake lines. We have brake fluid to all
the brake line hookups on the module but
when we tried to bleed the brakes, the
brakes will not build up press. We pumped
them up off and on for over a hour and when  
we open the bleeder their is nothing no air or
fuel, but we are not losing and fluid either. It
is like it isn't  taking and fluid, but every
connection is tight. Any idea on what the
problem could be?