Fuel Pump Options

[96Turbo]

Hey there. I've got a question that endless forum/google searching wouldn't answer. When swapping an RB engine, you need more fuel flow. I know a 255 lph pump is recommended. I also know that Q45 and 300ZX TT pumps flow enough. My question is: Do i need a FPR when using one of the OEM pumps? I've heard the walbro pumps/universal pumps are "hi pressure" and require an FPR in order to lower it to a reasonable level. What about the OEMs?? Would the stock pressure regulator suffice?

[burnsauto]

stock pressure regulators are okay.

[96Turbo]

even on a walbro 255??????????

[250sxdet]

I run an rb25 with the the walbro 255 and stock regulator. havent had a single problem in 1.5 years.

[96Turbo]

nice. hopefully that will work for me too! Thanks for the input

[bejota180sx]

dont know if sr is the same as rb but i have had walbro with stock regulator for 2 years and still no problem with that...

[!Zar!]

If you're running a stock engine then a stock fuel pump is ok. Upgrading your fuel pump with a stock engine is dumb and will only make your fpr work harder with no gained performance.

With a rb it will already have the fpr that is suited for it. Unless someone took it off of the motor which I doubt. So you just need a upgraded fuel pump. Walbro will be fine.

[PITCH]

Q45 fuel pumps are the same or similar to Z32 TT pumps?

[UNISA JECS]

Hey there. I've got a question that endless forum/google searching wouldn't answer. When swapping an RB engine, you need more fuel flow. I know a 255 lph pump is recommended. I also know that Q45 and 300ZX TT pumps flow enough. My question is: Do i need a FPR when using one of the OEM pumps? I've heard the walbro pumps/universal pumps are "hi pressure" and require an FPR in order to lower it to a reasonable level. What about the OEMs?? Would the stock pressure regulator suffice?

Some times you do require an adjustable fuel pressure regulator, although the fuel pump doesn't suppply fuel pressure, it does provide volume, (the FPR is the door stop that makes pressure) if this volume is to great (in some cases it is) for the FPR to bleed off and return back to the tank, the end result well be a higher fuel pressure at idle and cruise.

Second some Nissan/Infinti V6 and all V8 uses what is called a FPCU (fuel pressure control unit) what this device does it regulate the voltage supplied to the fuel pump at idle and cruise to anywhere from 6-8-10volts and at WOT = battery voltage. The reason for this because for one it extends fuel pump life and two keeps the fuel pump from over running the fuel pressure regulator.

Third when we install Nissan Z32 TT or Q45 pumps which are very high output pump into our cars these pump run at high output mode 24/7 and this is why they are so damn noisey in our cars because there not regulated at idle and cruise, instead they get a full dose of battery voltage.

Q45 fuel pumps are the same or similar to Z32 TT pumps?

Similar, I believe the Q45 even may outflow the Z32 TT pump.