thaumcraft void jars and buffers

[niewazne]

so i attached a bellows to a buffer. Now buffer has 32 suction.I attached a void jar to buffer.
Problem is my void jar stores 64 essence and then stops sucking and essencia stays in buffer.
By the definition the void jar is made to take more essencia then its supposed to , no other point in keeping void jars.
So question is how do i make my void jar suck all the essencia from buffer?
Or maybe theres an other way to keep sucking essencia from buffer all the time?

 

[RJS]

If I recall correctly, void jars have reduced suction. Combined with you increasing the suction of the buffer with the bellows, the void jar is probably unable to pull essentia from the buffer.

 

[netmc]

There is a tool that will let you check the suction level for each pipe. I don't remember what it was called though. Vis moves to the device with the highest suction, so if the two are equal, vis will move nowhere.