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Old 08-04-2009, 09:40 PM
TchTchr TchTchr is offline
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Join Date: Dec 2005
Posts: 417
I don't think the plastic cap has anything to do with holding vacuum. I believe you will need a new modulator. Someone will correct me if I'm wrong.
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Brad
1981 300TD - daily driver
1963 Chevy II
2001 F-250 7.3 Power Stroke
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