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Hate to disprove the theory that an inline filter BEFORE the fuel
pump destroys the diaphragm in the pump, but I have been running this
way for years and not a problem. I am running the original type of
mechanical pump as fitted to the Sunbeam Talbot "Proper" Alpines.
FWIW.
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While it's true that the pump will function fine with a clean filter, it's when the filter starts to block that the problem is created. The diaphragm is meant to produce pressure on the outlet side, not a vacuum on the inlet side. THAT'S what can damage the diaphragm. You're better off with a post-pump filter, as the pumps almost never block with the paint flakes. It's just the carbs that have a problem with the flakes!
Besides, we all know they built "proper" Alpines much heavier-duty that the later "hairdresser's" Alpine! lol
Jon Arzt Rootes(at)aol.co ( I must be a hairdresser... I love my Ser V! )