As I said-
"the other tube is the silencer. This attaches from the underside of the blue screw attachment and runs down to the pump, it acts like muffler and silences the air noise. It can fill with water if cracked or punctured or the end cap has been pulled off. The best way to check this is to remove the pump, remove the blue screw, pinch you fingers over the blue screw and the hole opposite of it that is under the cup (just on the other side of the plastic from the blue screw) and then blow through the tube that attached to the pump nozzle. If it holds pressure, i.e. you look like Dizzy Gillespie trying to blow into it, the silencer has no leaks. In that case the issue again is the water drain or depth of submersion and water is backing up to that hole behind the blue screw so water is sucked in instead of air"
You need to test this to determine if it leaks, or if the issue is the water is backing up into it. I would lean toward the water backing up into it because it isn't draining well or is too deeply submerged as they usually only leak if they were pulled on or messed with, it isn't something that happens spontaneously.
You are welcome to send it in, but I am on vacation next week so I would not be able to get to it until the 22nd and I think it must be a fairly simple issue, any pics of it installed and disassembled would go a long way.
"the other tube is the silencer. This attaches from the underside of the blue screw attachment and runs down to the pump, it acts like muffler and silences the air noise. It can fill with water if cracked or punctured or the end cap has been pulled off. The best way to check this is to remove the pump, remove the blue screw, pinch you fingers over the blue screw and the hole opposite of it that is under the cup (just on the other side of the plastic from the blue screw) and then blow through the tube that attached to the pump nozzle. If it holds pressure, i.e. you look like Dizzy Gillespie trying to blow into it, the silencer has no leaks. In that case the issue again is the water drain or depth of submersion and water is backing up to that hole behind the blue screw so water is sucked in instead of air"
You need to test this to determine if it leaks, or if the issue is the water is backing up into it. I would lean toward the water backing up into it because it isn't draining well or is too deeply submerged as they usually only leak if they were pulled on or messed with, it isn't something that happens spontaneously.
You are welcome to send it in, but I am on vacation next week so I would not be able to get to it until the 22nd and I think it must be a fairly simple issue, any pics of it installed and disassembled would go a long way.