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Old 07-17-2021, 05:16 PM   #21
Stl-986
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Join Date: May 2017
Posts: 1,180
As a test I went ahead and used the hand pump and pumped it up to 20hg before heading out to dinner. Came back 2 hours later and it has held at 20hg. This is with it just teed into the vac lines and the engine off.
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