Vacuum storage leak check

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halbey
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Vacuum storage leak check

#1

Post by halbey » 01 Mar 2018, 19:42

I wanted to make sure my headlight vacuum storage tank is not leaking before going thru the process of repainting it. I have a Mighty Vac - how much pressure should be applied and for how long? It is for a 1969 XR7.

decarguy
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Re: Vacuum storage leak check

#2

Post by decarguy » 01 Mar 2018, 20:39

Engine vacuum will rarely be more than 20 inch lbs. So a test in the mid 20s would be sufficient. I would say if it holds steady for a minute you are good to go. You will want to get rid of any leak in the can that is noticeable in that first minute.
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Don Rush
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Re: Vacuum storage leak check

#3

Post by Don Rush » 02 Mar 2018, 12:49

It will take forever with a hand pump, submerse it in a 5 gallon bucket of water and pressurize it to 50 psi or so, look for bubbles.

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JETEXAS
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Re: Vacuum storage leak check

#4

Post by JETEXAS » 02 Mar 2018, 13:57

Is JB Weld strong enough to patch those tanks or does it need a real weld?
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Don Rush
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Re: Vacuum storage leak check

#5

Post by Don Rush » 02 Mar 2018, 14:29

They can be had for not too much money. JB will work for a time, welding to thin rusty metal is pretty difficult.

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JETEXAS
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Re: Vacuum storage leak check

#6

Post by JETEXAS » 02 Mar 2018, 14:46

I just wondered because I always see them welding up the vacuum tanks on episodes of Garage Squad. I'm about to reconnect my AC tank, and I'm 99% sure it will have a leak.
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halbey
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Re: Vacuum storage leak check

#7

Post by halbey » 04 Mar 2018, 16:42

Don, thank you for the tip on testing the tank. It passed. Time to paint it.

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