Old thread, but a confession.....
Output consistency issue was caused by a blocked parrot vent, I could've sworn I checked it several times! :angry-banghead: :angry-banghead:
What i found in the junction of vent to parrot down tube was a wad of MDF or something wood. I can only assume the manufacturer inserts this to reduce TIG cancer coming through on the inside of the pipe work. Once found I tried removing with a screwdriver, but wouldn't move. I drilled it out and then put a nominal bore sized drill through to clean it out once and for all. All up it cost me $100 to sort this out, $80 for "unwelcome advertiser" 2" to 3/4" vacuum breaker + $20 postage from the fecking theives!
Pictures of MDF smegma found in parrot vent



Anyways full steam ahead without any surging or bullshit, just a constant stream we all aim to achieve :dance:
Thanks to all who chimed in to assist with these teething issues! :text-thankyoublue:
Cheers