ok i've been on the phone to the injector cleaners and as we were taking here asked me like you did about the return flow and i told him about the trickle
He also said that those single point injectors are normally pretty good
so if we are getting 38 psi in to the throttle body and a trickle out would it be the fault of the regulator and how would i fix this
should i get the adjustable after market model ?
Not going to argue the issue with the fuel injector guy, just part of what he said doesn't add up to this non-expert. Hydraulics is hydraulics no matter where your at. "Pressure excreted on a fluid in a confined space, and acts with equal force on all areas". If a valve opens and the hole allows for a passage of fluid without a restriction, then a fluid will pass at a specific rate so long as the valve is open.
If you have 38psi at the throttle body line, and the vale opens for the correct amount of time, then the fluid passing will be the correct amount based on the design. An injector is designed to pass a specific amount of fluid based on pressure and the time the vale is opening. The only thing I can see that can reduce the amount of fluid passing, is the valve is not opening all the way, there is a restriction in the valve, or there is insufficient pressure.
Your pressure is sufficient, so I do not understand the injector persons his/her analogy
To answer your question, the regulator is part of the VST, and I know of no way to repair it.