i searched already but couldnt find this. i found what it should be stock but here it goes. what should my fuel pressure be at on a 00 civic si with a 255lph walbro intank fuel pump?? thanks

 

If you are running stock injectors 38-45psi. Start low and turn it up a little bit at a time to where the car feels good.

 

how can i turn it up? i do have stock injectors and i have a fmu but and i have the stock fuel pressure regulator

 

You can adjust with the FMU if its adjustable.

My idle pressure is about 50psi with stock rail and fpr driven by a walbro 255.

 

get an adj fpr. without an adj fpr, your car is going to run rich, especially with the fmu. when i had mine, my fuel pressure at idle was around 60psi.

 

thats the thing, i asked this question because i should be running rich but im running lean. i had a question. i had some 880s in and now that i put the stock inj back on its running lean for some reason, everything is back to stock and its running lean. could it be a distributor problem? cause i got oil in there from the oring going bad

 

is ur fmu adjustable like muckman suggested? cuz that's the only solution i see without having to change anything else.
the fmu would have to be restricting pressure by alot for you to idle those 880s if that's the only management you've got.
throw those stockers back in with the same fmu, and now ur getting less fuel than stock. therefore ur lean condition. you can try taking out the fmu and make sure it runs fine like that.

 

it runs the same with or without the fmu. im getting a cel 67 which is the catalytic converter.