Could this be the printhead? yellow ink fading and stops

[barfl2]

nippynoo just a thought have you got any ink into the maze on the top of the cart. With the German method the maze is at the bottom and over pressuring the cart. any ink in here would effect the flow. I use 2" 20G blunt needles and drill my hole low enough so that I can see the needle run along the bottom of the cart. I use a 1mm drill

If you suspect any ink in the maze you can try blowing down through it. or do what Peterbj suggests purge the cart and refill.

with regard to seating the sponge the usual suggestion is hitting it firmly on a hard surface i.e. desk/worktop rubber would not work.

hope you sort out your problem

 

[BrightGuy]

The yellow ink fades out, and then doesnt print yellow at all, but the yellow cartridge is full of ink.
Is it the printhead? But the yellow starts printing, so presumably isnt blocked?

Some years ago, yellow starvation occured to me. I replaced almost everything before discover the yellow ink was guilty. Simply, a new batch of yellow ink was bad. Exchanced it and everything went back ok automatically.

 

[nippynoo]

I've replaced the yellow cartridge with a new Canon OEM one and it now works fine. So many thanks to all who replied. The streaking has gone.

When I need to make a hole in the cartridge for the German method of refilling, I'll be more careful pushing the needle in, because I must have separated the sponges.. or got ink onthe the "maze" as suggested.

 

[ThrillaMozilla]

You can knock the sponge(s) back into position, if that's what it is. Look here: http://www.nifty-stuff.com/forum/viewtopic.php?id=7486 . Put a strip of wood on the bottom to protect the exit port from damage. You don't want to put any dents in it and ruin the seal.