Hi Dave,
Today I noticed that there is a fine stream of bubbles running in the fuel line that connects the regulator with the carburetor. The bubbles get bigger during idle and almost disappear in full. The lines from the tank to the engine are bubble free --. What do you recommend?
The engine ( YS 63 FZS is working fine despite the air problem 2600 -12000 with an 12*6 APC and CP 30 LS fuel )

Thanks in advance.
Brian
I attached some pics...

NORMAL. We've been over this at least 100 times in these threads. Bubbles in the line from the reg to the carb are normal.