Inline 6 Blow through Turbo help

[the idiocracy]

Okay, so here is the background

1967 C10, Longbed, Stepside, original inline 6 (250ci) in it. I decided to do a blowthrough turbo setup instead of putting in a SBC or doing an LS swap. Everything is in and its running (I'm friggin amazed...I don't know crap about turbo carb setups...its been a learning experience for sure). My issue now is fuel. I disconnected the lines from the stock mechanical fuel pump and put an external electric pump and a boost referrenced fuel pressure regulator inline. The reason for this is that the fuel pump needs to supply fuel about the boost pressure and the mechanical pump can't do that.

Here are the specs on the pump that I am using...

Brand:Trick Flow Specialties
Part Type:Fuel Pumps, Electric External
Product Line:Trick Flow® High-Flow Electric Fuel Pumps
Summit Racing Part Number:TFS-25004P

Free Flow Rate: 43 gph
Maximum Pressure (psi): 45 psi
Inlet Size: 5/16 in.
Inlet Attachment: Hose barb
Outlet Size: 5/16 in.
Outlet Attachment: Hose barb

https://www.summitracing.com/parts/tfs-25004p

The problem that I am having is that something is causing it to not provide constant pressure. I am trying to upload a video to show what happens. The pump doesn't make a consistent hum, it sounds like its straining and then it ...nevermind, let me see if I can upload this damn video. Its 2:30ish, so its kinda long, but I videoed the entire engine bay, everything I could get so and carb turbo experts can look over the setup and identify anything that I have done incorrectly.

https://www.youtube.com/watch?v=HTvlf80lA74


I know there is wiring and vacuum lines everywhere...that will all get cleaned up. I appreciate any insight anyone has.

I am thinking that the pump is trying to pull fuel at a rate so that it can supply fuel at 43psi. The fuel lines are 5/16" from the tank to the pump, so I'm not sure if that is sufficient to supply fuel for what the pump is trying to do. Additionally, the regulator is bringing that 45 psi down to 5ish at idle (not under boost).

Is it possible that the pump pulling too hard and the fuel lines can't support it? I popped the gas cap off to make sure the tank isn't vapor locking, so thats not it.

I should also note that the regulator is a Non-Return style. This one...
https://www.summitracing.com/parts/sum-g3032b/overview/

Im at a loss here.