Guys,
I had a similar issue with getting a new impeller to work. It was suggested by Don that soaking the new impeller in a light oil might "swell" the impeller enough to allow it to seal. I tried this with two new impellers and left it soaking for a number of months, while using my old impleller. When I put the soaked one in, the pump worked perfectly, and will self prime itself from dry. This soaked impeller has been working fine for the last three years.
Might be worth a try.
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