Erratic/Fluctuating Fuel Pressure CA18DET
So I am hoping this video link below works. Here is my issue.
I have a CA18DET fitted in my old RA23 Celica.
Just as my car comes on boost (around 4-4.5K RPM) it goes flat, at 5K it takes off. I thought it was the PCV that was stuck, but this only partly solved the issue. I then checked the fuel pressure. Pressure is at 40ish psi (vacuum disconnected), but erratic.
Here's the weird thing....
When it is connected to the fuel tank return it is erratic.
When it is connected to the fuel tank return but disconnected at the tank, it is erratic.
When the return goes back to a tub (coke Bottle) it is fine.
When the return goes back to a tub (coke Bottle), trying lots of different sized restrictions, it is fine.
WTF! Any ideas?
I do have a new regulator on the way, but this just seems odd.
https://photos.app.goo.gl/FMJHRMgYeiBKG45E9