IMHO, the mechanical pump is a good thing. It's weakness is the strainer basket on the inlet which is useless and prone to leaks. I think Moyer sells a replacement strainer basket. Still useless, but less likely to leak.
I changed to electrical pump and used it for years. Issues with it are 1) that it needs the oil pressure safety switch, and 2) it's electrical. Every time it cycles to pump fuel, a little switch is going OFF/ON. I never trusted it.
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