I bought these tools years ago, my version of Vag-Com is PC laptop based purchased from Ross Tech
http://www.ross-tech.com/vag-com/. When I bough the Lumi Probe when (then the 386 was king and laptop hook ups were a twinkle in some ones eye) I was in the auto repair business for 14 1/2 years, I have been out of it for 8 years (I don't miss it one bit). The Ferret 765 was a $35 bargain on eBay (before the P4 was created). When I find a good PC system for my Laptop, I will get it, I feel it will be a better tool than a code scanner.
We all need to keep the level of technology for the time in perspective, you can't hook up a lap top to a Rabbit, but you can a TDI. As much as I like my liberty CRD, there are old diesel engines out there that can run a lot better than they do. My pop tester will not work on my CRD's nozzles, but they will on an circa 60s tractor. Ignoring the hands on history of Diesels is like the military blowing off the teachings of Sun Tzu.
Is there a good lap top cable/software setup for the CRD?
On the air leak at the quick slip fitting, don't factor out road vibration inducing a leak under low head presser vacuum even with out any restriction at the intake mesh.
I have had vacuum leaks on diesels down stream of the lift pump with no intake mesh in the tank.
What is the size of the mesh for the pick up tube in the tank? Sand blocker?
Too fine a mesh will wax up in a heart beat like the VW Rabbit Diesels did, I yanked a bucket load of them and tossed them.
Steve