SR20DE fuel pressure question

[Bigtaku]

I have a question for the SR20DE people out there. The car runs and starts perfectly when cold but after warming up it will not start unless I unplug the injectors and crank the engine over to drain the fuel. After I plug them back in the car will usually start the first try but not always. My HOLLEY IN-TANK RETROFIT FUEL MODULE
255 LPH Drop-In Retrofit EFI Fuel System w/Hydramat
Supports up to 550 EFI or 700 Carb HP (HP Rating @ 60 PSI at 13.5 Volts / 10.4 AMP Draw) is sending more fuel pressure to my engine than I need. The SR20DE manual says I should have 43.4 PSI. I thought the fuel regulator would adjust it down to the proper PSI, and it may do just that (I haven't checked the PSI from the regulator). Has anyone else had this issue? It's a pain in the rear to unplug the injectors...
I checked for errors and the CAS came up but if that's the issue than why does unplugging the injectors work?

[redroadster]

See if you have a leaking injector
How much gas. We talking ?
You need a gauge on it
The FI ECU may be faulty or have a glitch in wiring
Without a OBD 2 port it's a cluster f to deal with multimeter data checks tapping into wires

[Bigtaku]

See if you have a leaking injector
How much gas. We talking ?
You need a gauge on it
The FI ECU may be faulty or have a glitch in wiring
Without a OBD 2 port it's a cluster f to deal with multimeter data checks tapping into wires

I have Nissan Connect, which is way better than nothing. I need to go get a pressure gauge today. Checking for a injector leak is my next step. Back to my question about the fuel pressure regulator, is it designed to get the pressure back down to 43.4 psi from the 60 psi from the pump?

[nissantoy]

Bigtaku

My SR20DET has an aftermarket adjustable pressure regulator with a gauge, not that expensive or hard to install. Might be worth the effort.

Nissantoy

[eye]

These work well
Also some diagrams for you to help with plumbing.
https://www.tanksinc.com/index.cfm?ptyp ... 2&mode=cat

[Gregs672000]

I'm just learning about EFI, so keep that in mind. However, I'm understand that a return system is very important for what I'll be doing, and I wonder if and how your return is working or whether you have one. Is the system dead headed or does it return to the tank? The pressure regulator controls the pressure, not the pump. The aftermarket regulator I will be using bleeds off the extra fuel in the return. Without it, you can have pressure spikes and may need to make other injector function changes that I'm still learning about. Again, this is aftermarket design, not engine swap, so Spriso will likely be a good knowledge source.

[eye]

Center line to rail is full pressure from the pump. Line coming out the rail goes to fuel pressure regulator. Return line goes back to the tank.
You can regulate it before or after the rail. Look at the diagrams I sent you in the link. Different ways of doing it. I run an AEM sensor right in the rail.

[bobd]

See my reply in Fbook.
The stock regulator does the job fine in my S13.
Definitely get the gauge.