Do yourself a favor and replace rusted parts whether or not they're working properly. That fuel pressure regulator hat is just waiting to rust through and cause problem, most likely on the water.

^^ Agree, would be a good idea

Also check for a blockage going back to the canister filter. If the line is blocked, pressure cannot be regulated. Need to find out why pressure exceeded limits. Was the screen clogged?

A clogged vacuum line wouldn't cause pressure to get that high. The vacuum just changes the pressure a few psi

so I'm assuming this isn't the boat being discussed. If it is I have a lot of insight.

No need to apologize and I'm really glad that is not the boat. Not that it's a bad boat actually was awesome but it is/was ProCharged same year approximate hours and other mods. It has been for sale for a while and I was hoping nobody did something dishonest. This is a tight group and we watch out for each other.
The modifications are really unique for a naturally aspirated boat and I hope you sort out the issue. It truly sounds like the wrong tune in the computer, there are so many variables it would almost be worth talking to someone who can look at the setup on it.

No, it is nit a valid test. PSi opens it. It is a fuel psi regulator. VAcuumjust changes the psi (ust a few psi) needed to open it .

The return on the regulator opens at the preset psi.Sp, if it's 40psi regulator,the regulator should be partially open just after that psi.