Hotpoint Aquarius VTD?

The condenser sucks out the water, but it does not carry to the top where the tank is. I have checked the black pipe, nothing /(fluff) blocking it. What makes the water travel up the black pipe to the tank? If I can figure that out I would be able to figure out how to fix it. The machine is two years old, rarely used, and never over loaded. Mine is a fairly quiet machine and worked well up to now when I realised the water tank is always emty. Drying time is now longer as well