Syringe filling is better in my opinion because anytime you remove a grommet you are breaking the seal. Wiggling the carto around putting it back. You then may not properly reseal it. Or have moved the carto enough to cause an air leak on the bottom grommet. The syringe method will leave you...
Try sliding a safety pin between the grommet and tank to allow the air pressure to equalize. The leaking can be caused because after you fill there is higher pressure inside the tank than outside. Leading to leaking out the bottom till it equalizes.
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