Braided Fuel line leak testing

SO I purchased AN fitting kit to pressure test the lines. Seems like when I submerge the line in water, when it's of course pressurized, that I will get some bubbles from the bottom of the red fitting(where the red fitting screws onto the actual hose). That's the fitting that uses the braided outside as threads. It's not like the bubbles are fast, but maybe a 2-3 second delay between each bubble. These lines are pressurized up to 40-60 psi. My question is, should there be NO bubbles at all or what?