Vutek QS2000 continual Ink Overflow on channel 5

You have a problem with your suction leaking somewhere, the meter at the left should read somewhere around 50/54 to find the leak nip the clear plastic pipes in turn along on top of the secondary tanks that go into the electric valves at the front until you see the meter regain its correct pressure then work through that tank connections and o-rings

 

The machine I have is a previously much maligned Vutek GS2000 so as you are I am on a very steep learning curve, I believe that you have a suction leak at the bottom or below the secondary tank which is allowing it to draw ink up from the head and pipes and overfill the tank which then floods it

 

Ps the white blocks are where the vacuum is generated using compressed air I believe so if they work they will make a noise but check the connections even so

 

Also I am thinking that if vacuum is leaking into the tank it aereats the ink ink causing bubbles and also swells the ink making it overfill and bad print
Hope this helps let me know how you get on

 

If the over fill was severe likely have ink inside the overflow chamber Look on front of carriage, there is an aluminum block left-center with a solenoid mounted on right side under vacuum manifold. This is the overflow chamber. Look for a clear tube coming off bottom of this assembly, that's the drain tube. Use a syringe and draw ink down from chamber. Inspect and replace any clear tubing that has been contaminated.
if there is ink in the tubing the color of the ink is the suspect channel for secondary tank float failure.

Secondary to something in carriage there also may be o-ring damage within the ink coupler where it meets the ink jug. Would inspect inside the under side of the coupler.