[cglrcng]

Also, if you have more tubing avail., I would replace both the inlet and outflow tubing to/from the regulator (and maybe even the connectors to straights from 90's maybe) w/ a little longer tubes as they are pulling the connectors off center which can also lead both (all 3~Reg. in/reg. out/ & block in connectors to leak.

That yellow locking collar on the regulator is half way up, half way down in the pic....Up to adjust regulator pressure, down to lock. Get it into 1 or the other positions also...right side is down/left up in the pic. When it is in the adjustment position it leaks very slightly on purpose to help you adjust the regulator pressure so after adjusting it, always lock it.

Can you attach a few more pictures?

Start at the compressor and work back to the block please. Getting the High Pressure side completed first and holding air (always insert a pressure relief valve in it), dividing the system into sections, and then working towards the low pressure section 2nd. seems to work best when making sure the system doesn't leak.