If there is vacuum, it must be coming from the tank. Do you have a vented cap?
Isn't the check supposed to prevent siphon? If air is getting in and you've replaced the valve, maybe there is a leak at the connection?
Also consider moving the check valve as close to the nozzles as you can.
Last edited by 435gc; 04-09-2024 at 07:39 PM..
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