Racors are still a POS. The worst leak to find is the drain plug on the bottom. Sometimes the o'ring goes bad (barely) and lets a little air in. But even tougher to find is when the plastic bowl leaks around the drain threads, just a small bubble every few minutes. But, in a case like yours (and countless others) it puts in air that doesnt get moved thru, just collects in a high spot. Will eventually shut you down, not good. Did I mention that I hate Racor filters. Get a Davco 382.
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