Shouldn't have to prime a flexible impeller water pump....it may very well be that thicker than normal gasket.
Old timers would use a paper shopping bag with a few drops of oil on it...they just put a piece over the whole pump and impeller, bolted the cover on and let her rip. The paper covering the impeller would just tear away and the part that was snug under the cover/edge of pump would remain and do it's job...been meaning to try it as gaskets are a PIA sometimes if they get a crease in them.
You might want to try that if nothing else works and you don't get the right gasket.
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