When replacing the top cover with large 0-ring of the Racor (whether you mount a vacuum gauge on it or not), be sure to not over-tighten it--whether you use your hand (as Racor recommends IIRC) or a wrench. I got carried away when I installed a vacuum gauge on the top plate and had more engine stalls with air in the line than I could count! My mechanic was as confused as I was but suggested that I replace the top plate of the Racor--voila problem solved! I evidently over-tightened the plate enough that I deformed it very slightly so that the middle of it (where the bolt/gauge is threaded into the bottom piece) was 'dimpled in'. As a result, the outer edge of the plate (which holds the large O-ring) was unable to seal properly when fuel was sucked thru it so air was admitted. When pressure tested, there was no leak since the pressure un-dimpled the plate enough to seal the O-ring! Talk about Murphy being a sailor!! FWIW, Charlie Nelson
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