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Vacuum pump check valve question 1980 300SD W116
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04-23-2012, 02:38 PM
barry123400
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
You might want to measure the vacuum acumulation at the pump. The general pump may need a kitting. Sounds like your check valve was okay unless it is sticking open in service.
barry123400
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