The container collapse is your visual cue that all is well in the vacuum 
world.  I have mine finely calibrated so I know precisely how much vac 
it is pulling.

--R

Mitch Haley wrote:
> Wilton Strickland wrote:
>   
>> If the oil sucker pump pulls too much vacuum, reduce it with an additional
>> opening in the vac hose - not the oil evac tube - the vac hose from pump/vac
>> to the oil receiver tank.
>>     
>
> I've decided to build mine with a scrap of standard 1/2" ID x 5/8" OD copper
> house plumbing pipe, and use 5/8" hose to the oil collector. 
> I just checked a few minutes ago, and the 1/2" copper is a snug
> slip fit in both my 190D and my 190e. I assume my 300SD is the
> same size. 
> More flow capacity in the oil tubing will lead to less pressure
> differential and quicker evacuation of the crankcase. I'm hoping that
> will eliminate any tendency to collapse the collection container.
>
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