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Setup: 7.3 pump, Dahl 100 on suction side to stock 6.7 filter (new). I have the return plumbed to a Fass regulator set at 18psi. Issue: The pump runs and sound normal for approx. 3 seconds then makes a fairly loud squeal noise for about 1 second and then repeats. My first thought was...

PowerStrokeNation : Ford Powerstroke Diesel Forum