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What does this capped line go to ?

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Old 02-02-21, 06:32 PM
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What does this capped line go to ?
Hey guys I’m about to redo all the vacuum lines on my FD and saw this capped end. Is it suppose to be like this or did the previous owner do something half assed.
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Old 02-02-21, 06:52 PM
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That second vacuum nipple is meant to be capped. It's just a spare in case you need it.
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Old 02-03-21, 07:22 AM
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NADM FD’s (and earlier JDM models) weren’t equipped from the factory with a boost gauge. That’s a common vac/boost source for an aftermarket gauge.
Last edited by Sgtblue; 02-03-21 at 07:25 AM.
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Old 02-04-21, 01:37 PM
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Yep. I think Mazda put it there for a diagnostic boost/vacuum gauge for service work. Also makes it SUPER handy to hook up a boost gauge.

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