I finally fired up my car with the GZ 104 vacume pump on it, I didn't put a remote vacume gauge on it to set the bypass but did put a larger hose into the bypass hole and hooked up a older Ecomiser vacume gauge into that hole. basically pluging it now that I think about
My question is on seeing either water vapor or oil bypass smoke coming out of the catch can, is this normal on a cold motor while warming it up? It didn't do it all the time, it seemed to start and stop
Last question is where did you put the permenant vacume hose fitting on your motors to monitor the vacume
I have called GZ twice today and got there answering machine both times, there probally tired of taking my calls and questions I'm wondering if it is good in a valve cover or is it maybe better somewhere else

You will see condensation in the tank.. thats normal
EDIT
I pick up the vac from the valve cover right over the
second rocker hold down with a good baffle.. I made
up a interlocking U with a top that I weld to the VC

condensation is normal. actually a pretty good sign you have good vacuum. i like reading it from as low as possible. if you have a fuel pump block off plate, you could get a reading from there.

Condensation seems to be normal for our motor. Our gauge is plumbed into the fuel block off plate. Thinking about changing things up and pulling our vac from fuel block off plate and hooking the vac gauge to the valve cover .

I welded up a threaded bung on the valve cover for the vac gauge.

Vacuum readings are consistent throughout so it does not matter where you pull it from.

As far as condensation goes - the lower the pressure the more water will be pulled out of the atmosphere. ( in the engine or not )

I run a GZ pump. Sometimes I see vapor if its cold out. My vacuum fitting is in my valley plate.
Doug

Yes I see vapor on mine. I pick up my reading from the back of a valve cover.

when i first installed my pump i saw water vapor but since the freshen up i see none. first run of the day collects the most oil(2-3oz) but after that its virtually none. my vac guage is connected to a rocker cover, 5" at idle, 10" at full throttle.

Some moisture is common.

The less vacuum leaks you have the less moisture you get in my experience.

Moisture is normal for me too...you can see my vacuum line fitting in the valley plate.

Yes I do see vapor on the start up after a week of just setting around. Also I run E85 witch my have a factor in the water vapor. I always let the motor run to 200 degrees before I shut it down after the final round I am in.

The hot air in the engine rises up... the VC cool
off first.. thats why you see the moisture up there

MrCab I see water vapor(moisture)on 1st crank after setting from one week to the next also.

I try and put the hose for my vacuum gauge on one side and pull vacuum and the pop off valve on the other side.If I mount the vacuum pump on the drivers side I like to pull vacuum from the passenger side,I do not think it really matters but find it's best that way to help keep it from spraying a fine mist of oil out the top of the filter when its at max pressure.

PS If I run one off another Big Block Mopar engine with the valley plate like Indy,I will pull vacuum from it as close to the center as I can get.

When you drain your vacuum tank you will also find a small amount of water the 1st time and this is normal.On an alcohol engine you will find even more water.

PS there is no need to worry about forgetting to drain your tank.If you do it will remind you when it needs draining!
I have the Wife save the small butter bowls to drain mine in.I like to leave my pit space as clean as it is when I get there.At the end of the day you can put the lid back on it and duct tape it and put it in the trash can.Some may say not to put it in there but I say thats better than draining it on the ground.

And, it mainly comes from the combustion process! Exhaust blowby. Even more from Ethanol mix