I have looked online checked the Haynes Repair Manual and nowhere in the fuel system is there a FPR like the one you posted the only regulator in the system in my 2006 is in the fuel pump assembly.Gotta ask- did you replace the fuel pressure regulator (pictured above) that holds line pressure for quick starts?
ok so I did replace that as a damper or at least that's what i was told it was buy the parts store.
I just replaced the fuel pump with a DW aftermarket pump and my Z currently has 47200 miles on it.40-42 PSI is low for resting line pressure on a VQ35DE. 50-52 PSI usually guarantees a quick start, but you're building line pressure by starting the car several times. Since you've measured it a few times and not found any leakage, I suspect your fuel pump is defective. How many miles are on this Z?
Short lived lol the car after being driven for about 2 hours decided to not want to start at all after it warmed up. waited til this morning and it took about 8 turns before it finally started. Im honestly puzzled at this point. Someone suggested to replaced the fuel pump assembly as it has a regulator that is known to go bad. In other words the pump works but it doesn't hold pressure in the line and after it works for a while (gets hot) it quits working properly making it hard to build any pressure and start the car.... IDK where to go from here.You're welcome, but I remain puzzled by the fix on this problem. If these are the original keys, why would a key reset be needed?