I have a JB 3 cfm pump about a year old. While I was on vacation another tech used my truck while his was in the shop and did a compressor changeout. He pulled system down with my pump WITH NO OIL INSIDE!!!!!!! I usually don't leave the oil in my pump when I change oil I just leave it empty and fill it the next time I use it. He apparently didn't look at the oil level.
I just got a Bluevac micron gauge and tried it out. Pump pulled down to around 150 microns.
Should it be able to pull lower than that? I am going to dig out my old Yellow Jacket pump just to see what it will do.
Do you guys rebuild your own pumps if needed?