a

 

throw that bullshit swirly-thing away and sell your 044. theres no need for all that with the amount of power you are making. an in-tank walbro 255 is all you need.

your installation is obviously flawed and starving one of your pumps.

 

Your fuse box is on the wrong side of the engine bay for starters... LOL
Just Kidding I can see where you are from.
Id chuck that system too and get the walbro 255.
What more do you need.
its what i use on my B-16 powered racer.
I dont see a turbo, or SC.
If your losing pressure through the rpm range something is definately amiss with that set up. What kind of injectors are you running?
What are you tuning with?? ECU mods?
Tuning to a loss in fuel pressure sure sounds like a sure fire way to cause an internal catostrophic failure to me...

 

There is a mod for the regulator that will help with this issue:

http://www.theoldone.com/articles/regulator/