Bill, top off the gun, and fire it for about 10 to 15 dry shots. Do it slow and deliberate, like as if you were target shooting. Then re top off and see if it leaks after that.
What solution are you using as your leak detector? Make sure if using soap and water that it is very bubbly by shaking the solution up before spraying, and make sure it’s coming from a fine mist sprayer.
Another good product to have on hand is CRC leak detector. It comes in a pressurized spray can and shoots a foam solution out that will form large thick bubbles around most pesky leaks.
If all else fails, you can do what myself and some have done, and that’s to remove the scope, stock and dunk your gun in water, looking for the bubbles. I prefer a five gallon bucket vs the bath tub as my thought is I may find the leak coming from the front part of the tube, the area I will dunk in first. No reason to get the gun all wet if I can help it. If you do end up getting the gun all wet to find the leak, it’s a good excuse to freshen up the gun with fresh lubes after you’ve dried up all the parts thoroughly. I recently went thru this with my Impact.
when refilling your gun from empty always do it in stages. Slow stages. Barely crack your tanks valve. I fill slowly to 100 bar and stop. I’ll wait five minutes then fill slowly to 180 bar, then stop and let the pressurized cylinder cool off again. Then from 180 slowly to spec fill, and I’ll go past spec fill by 10 bar, so when it cools off it’ll fall right at the spec fill.
