Canon G5050 - waste ink kit install [Feedback Pls]

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Thanks. I agree, I think the air comes in at the printhead end. In fact, as soon as you open the printhead holder so that the contact between the supply tubes and the top of the printheads is broken, air quickly goes in and the ink retreats back towards the reservoirs.

Yeah, Canon haven't incorporated a one way valve into their design which is a bit annoying.

I'll give that a go. Before touching the printhead holder, I will clamp down the tubes to minimise air ingress.

Was just about to suggest that last. I used that approach on a G4511 but as it doesn't have a maintenance/ship clamp I used some plastic forceps to crimp the tubes. Was able to remove the black printhead for manual cleaning that way.