Originally Posted by
jmayerl
I switched to the 4008's last season because I couldn't get max vac with the 2088's. I would also look for small leaks or possible a tapped tree that is hollow. ( I had a healthy tree that I once hit a dead spot in the wood. I also have only used the recirc line once and that was a marginal day last week, still maintained 28"
This is fascinating to me. I have not been able to achieve those levels at the pump reliably. You are talking about the vac at the manifold, right? I will have an extra 4008 and will try again in my shop, with exactly the same setup as you and see if i can replicate your results. Out in the bush, with any significant number of bubbles, (no big leaks, the sap is moving at a steady, reasonable rate and no obvious leaks on any fitting) I just can't get those levels fo vac.
if these pumps work this well, a half a dozen $90 pumps could replace a liquid ring pump and releaser on a 1000 tap bush.
John
2x8 Smokylake drop flue with AOF/ AUF
180 taps on sacks
75 on 3/16 tubing with shurflo
Eden Prairie, Minnesota