6.8L tank leak?

[Powerstroke]

After I fill my tank to 300 Bar/4350psi the next day it shows a loss of about 500psi? I looked for leaks with soap/water and no bubbles? What else could it be?
Thanks in advance.

 

[grackleblast]

It has cooled off and the pressure dropped accordingly. When you compress air it heats up . As it cools down , the pressure will drop a little.

I usually fill my tanks to 4800 - 4900 psi and the next day they are at 4400 -4450 psi.

 

[scubajeeper]

 

[Powerstroke]

Thanks guys!!!