Check valves... not sure how this would reliably work. Can't be a gravity check or the suction of the intake could open it under throttle modulation and run the risk of sucking in water, the exact opposite of what you want. OTOH, if it were a spring check the spring sizing would need to be a balance between opening under a water column yet not opening under suction or vibration. Probably the best option woudl be a manual valve or a 12V solenoid valve if reaching the manual valve was difficult. One could always run clear tubing out the bottom to a visible location along the fenderwell to serve as a sight glass. Just don't trap the liquid. And passing out of the filter housing would also require a bulkhed fitting, that itself would create a lip trapping some kind of puddle at the base.
Too bad there isn't a rubber nipple like on the cyclonic intake that came with the round Austrailian filter housings...
Too bad there isn't a rubber nipple like on the cyclonic intake that came with the round Austrailian filter housings...
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