When I tested mine I adapted an air fitting to the vent hose, installed the fuel fill fitting on the fill hose (it sealed quite well) and put a gauge in the line at the outboard. I then isolated the air system and let the system sit. I've read somewhere that 3psi is the uscg test pressure, and tested for 30 minutes. Used soapy water to test for leaks at all the hose/fitting joints to catch any small leaks.
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