Canon Continuous Ink Solution Problem

My cousin gave me a Canon MP198 printer which had CIS(Continuous Ink Solution) Kit installed. It was a year old and was perfectly working when I got it. I had no print jobs for like a month but i stored it properly, had the rubber plugs and the ink valve shut tight.
I was to use it again but my colored document turned out black. I inspected the ink lines and found that the ink receded around 5 inches from the cartridge. I performed deep cleaning, the ink level from the tanks is down to a quarter but the ink still won't reach the cartridge. Anybody have similar problems?

