My binks mach 1 leaks paint as soon as I apply air pressure

The air hose between the tank and the gun is clogged, possibly by a bug nesting in it. The second place to look is the regulator on the pot. Insure that you have free airflow from there to the gun.

The pressure at air inlet should be 2 bar which then results in less than 1 bar at the air cap.

That is a great old spray gun. I used to spray auto enamel at about 35psi when I was painting cars.

spray gun is cloged (clean it!) also check gaskets in gun and vent hole in cup lid ( could be cloged)

There are different filter screen sizes for different thickness of paint. Even with proper screen size one might need to thin paint. I hope this information is helpful. Please give a rating if this was helpful. Good Luck and have a Great Weekend.

Worked in paint repair shop for 18+ years. Every time we had that issue it was the wrong air cap. The particular model we always had trouble with was a Devilbiss JGA going from a pressurized system to a 1 quart cup. But the Devilbiss and Binks are quite similar.
The air cap from the pressurized system would actually cause a reverse pressure in the cup.
Both air caps were for this gun. Also the Devilbiss
rep said they should be interchangeable.
They weren't. Try a different air cap.
I'm kind of curious so please let me know if this works for your Binks.
Good luck!

To fix this problem you need to turn up the pressure both at the wall(coming from the air compressor) and at the gun. I would suggest 10 more psi at the wall and 5 at the guns but you can play areound to find whats best for you.

Any air leaks in the suction portion of the machine will cause it not to spray or spray weak. This is a airless paint spray correct? Your paint should be at least thin down using 1 gallon of water for a 5 gallons of paint. I find Baer paint is even thicker and had to slowly add more water.

To check if it is your paint. Fill a bucket of just water and see if it will spray your water. Of course after it gets a good prime. Let it recirculate until the water is coming out of the bypass as a solid stream. If it does not spray water then you have either a air leak or your pump packing needs replacement.

Let me know the results and the make and model of the machine.

Hey paul its paul. I posted on here so hopefully you will give me some feedback. That is a very nice gun. One of my favorite. I'm guessing you know how to use a HVLP gun but if not here are a few tips. Make sure it is clean. Very clean. Your gun probably came with a manual, you should read it. It will help you greatly. First off, you want to have a regulator, about 40 psi is what i start with. You need a space you can practice some painting before laying down a new coat on the corvette. Haha. So next you will have a pressure adjustment knob, you want to start with this all the way closed and with the trigger pulled, just half way so just air is coming out adjust the air until it sounds even. Next you can try to spray. If it seems like the Fan, like the width is not enough you can adjust the fan, another knob, closer to the back of the gun, you ussually want about 5-6 inches of fan, if you are spraying at the normal 6-8 inches back from the piece. Last adjustment is the fluid adjustment, you want to put on a decent amount of paint, clear or primer, and not cause runs. This is going to take some practice because everyone moves at a different speed.

So you are going to have to play with your gun and figure out which knob does what. After that these instructions should get you a bit further, with some practice you will be laying down a nice paint job in no time.

Paul.

Sounds like you need to completly dissasemble and clean thorougly.