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  #1  
Old 02-28-2004, 07:18 PM
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embarrasingly simple vacuum line questions

I searched but maybe this is too basic.
I am planning to systematically replace my vacuum lines, connectors and fittings. I have no problems now and hope to avoid them.
Since the car (89 300CE) constantly holds a vacuum, when I break into the system to replace a line, the vacuum is lost. Will it re-establish the vacuum when I re-start the car after the replacement? Do you "pinch off" vacuum lines like a fuel or coolant line to isolate the spot you are working on?
Will I need the vacuum testing tool? Which one?
I can't find a schematic of the vacuum system comparable to a wiring diagram. Do I have to buy the CD?
thanks
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  #2  
Old 02-28-2004, 07:33 PM
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Will it re-establish the vacuum when I re-start the car after the replacement? - yes

Do you "pinch off" vacuum lines like a fuel or coolant line to isolate the spot you are working on? - no just disconnect it and use a MightyVac to test that circuit. You will need a MightyVac.
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  #3  
Old 02-28-2004, 07:34 PM
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Replace one line at a time ( with the engine off ).
Your vacuum will be restored, the minute you start the engine.
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Old 02-29-2004, 11:24 AM
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I to was also thinking of replacing all my vacuum lines one at a time,, I was told that even a slight leak would causemy car to idle improperly. Does anyone have a schematic of the vacuum system on a 1991 300E?? What is a Mighty Vac and how will it be used??
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Old 02-29-2004, 12:05 PM
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Cool

I have no problems now and hope to avoid them.
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Reminds me of the saying....."if it ain't broke, don't fix it".
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  #6  
Old 02-29-2004, 12:07 PM
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Understood, but with the age of the vacuum lines and connectors, they are going to and in some cases already have started to get brittle and oxidise if you will..... i just want to do it piece by piece ,, a new vacuum line and connector will not hurt or adversly affect the engine in my opinion,,, now if its something like an alternator or something like that i always say if it isnt broke dont fix it..
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Old 02-29-2004, 09:01 PM
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"If it ain't broke...."

I agree Rockman59, but from what I've read here, a vacuum line failure can strand you. Mine are getting brittle.
But mostly I can't resist messing around with my car. So my answer starts with, "An ounce of prevention...."
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