Much printer not printing Yellow

[Accelerated Graphics]

I have a Mutoh RJ-900 that prints sublimation ink, It is not printing yellow. I can see in the lines that the last line to the right is not full of ink. It has ink in it at the "T" where the 2 lines seperate and goes about 3 inches then changes from yellow to clear..
Does it need a damper??

 

[randya]

Possibly.
Could have an air leak.
Or just an air bubble if the cart was emptyl.

Have you tried a series of 'cleanings' while watching the line to see if it fills?