Sorry to be a party pooper but you really shouldnt need the airline to break the siphon. Think of your toilet. With the trap installed as you posted above in post #13 (i.e., just like every trap on any drain in your house) the siphon will not draw all the water out of the piping.
HOWEVER . . . the setup you you put in post #11 is your only real chance of having a "self-priming" effect on the pump IMO. With the setup in post #13 once the skimmer empties and draws air into the influent line water will sit in the pipe to about the level of the elbow just outside the pump intake. There will be very little water sitting actually on the pump head itself. You may actually get the pump restarted by luck but I'd bet not.
If you did what you show in post #13 but instead of heading down just go up at 45deg angle then turn down you'll leave plenty of water directly on the pump head. I have a pic I drew but it exceeds all the attachment sizes.
HOWEVER . . . the setup you you put in post #11 is your only real chance of having a "self-priming" effect on the pump IMO. With the setup in post #13 once the skimmer empties and draws air into the influent line water will sit in the pipe to about the level of the elbow just outside the pump intake. There will be very little water sitting actually on the pump head itself. You may actually get the pump restarted by luck but I'd bet not.
If you did what you show in post #13 but instead of heading down just go up at 45deg angle then turn down you'll leave plenty of water directly on the pump head. I have a pic I drew but it exceeds all the attachment sizes.
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