Hi @llq , can you check whether the air is coming from the tank or from something in the plumbing before the pump? a 3-way valve, faucet, connection or the filter?
The pump shouldn’t have problems priming, the air vent is there to be used only when the gears are completely dry or the pump is very old and the gears are worn out.
If you see that the issue is in the filter, unscrew it on both sides and add some teflon tape to the connections. When placing the tape, make sure that no abundance of it makes it way into the pump, because it could be an issue for the check valve (if your pump is electronic).
If the issue is in a faucet, connection or three-way valve before the pump, apply the same principle of trying to stop the air from going into the hoses. Some use the “liquid seal” for all the connections, to be sure.
Anyway, the air vent cap screw should be a metric M5 (I’m on holiday, if you need to be absolutely sure I have to check), but automating the vent it’s not a real solution, but a workaround :)
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