When you go to buy new vacuum valves, take your Mityvac with you and test them before you pay for them. I have seen brand new ones that leaked. Those valves are like single pole double throw switches. One port should hold vacuum in rest position, the other port should hold vacuum when actuated. A good one will have little or no leakage. If it leaks down in 5 or 10 seconds, it is NFG.
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Palangi
2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg
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