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new pump or old ? I just dealt with a brand spanking new melling that leaked , it was coming from between the cover and the body. I took it apart and it looked as though it had been surfaced on a rock but there was a cut on the o ring, I ended up lapping the cover and the body and new o rings and it doesn't leak a drop now.



The newer Mellings that I've had are very poor in their QA/QC. Check the pressure passage alignment between the cover and the body too.