You have a shut off valve near the intake on the bottom of the boat, it'll be right by the engine. Is it leaking out of the empty ports? I don't think you have shut off values at the empty ports at least I don't, I run an overflow system to my PWT bags. You could pretty easily put some in. It would have to leak past your pumps if it's leaking out of the empty ports, you may just have bad pump impellors. I would check those first. Make sure you have the green ones not the yellow impellors.
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