pressure drop while adjusting nismo FPR?

[jt15833]

Just installed the nismo regulated and smoothed out the bores of my fuel rail a little bit which fixed my leaking issue. Now there are no visible leaks, nor are there any leaking noises once the pump has finished priming.

how I have been adjusting the regulator is turning the key on til the pump primes, adjust the nismo unit, and keep repeating until 36 psi. I am not sure how much pressure drop should be expected, but I am down to about 30 psi once the pump has finished priming, and 10 psi after 5 minutes. This seems like a bit to me, but I do not know how the regulator operates once the car is off and if it supposed to drain this back into the return.

That pressure drop seems like it would be a bit of fluid, and I have adjusted and readjusted my nismo a few times, yet no visible sign of liquid fuel. I may just be paranoid from my leaking injectors but i do not want to leak fuel! Any input welcome.

[Indecisive]

it should hold a lot longer than that.

I just worked on my car a few days ago, and remember seeing only about a 15psi drop after 4hours or so.

[jt15833]

i think part of it may be this is a fresh install of fuel rail and injectors, so there is probably a bit of air in the rail/injectors causing the fast pressure drop.

what fuel pump are you on? Mine is a walbro 190lph.

[r34 gtr]

You need to jumper the pins in the relay box next to the battery so the pump stays on, and you can set the static fuel pressure. Float6969 did a nice little writeup on it, so check out the FAQ/Writeup section.