Vacuum canister test?
#15
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Location: Memphis, TN, Earth, Milky Way
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To me, that'd be like shopping for solid rubber tires, or a 2G alternator - it wasn't any good when it was new, so why put another one on, when there's a VASTLY superior Ford part available for no additional cost, and it's one that came on these trucks (a year or so later)?
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#17
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Rust isn't why it fails - it just makes it fail a little sooner. It fails from metal fatigue - the can isn't thick enough for the repetitive pressure changes. Plastic doesn't suffer from brittle fatigue, or corrosion.
#18
I don't live in a dry climate, and mine rusted. I would have been wise to buy and modify a plastic replacement. I do not anticipate your metal vacuum reservoir will fail from fatigue.