New Fuel Pump

[Jon88]

Hi people, sorry if there is a thread on this already, i searched for it but couldnt find anything regarding this directly. I just purchased a new nismo fuel pump and fuel pressure regulator (for my r33 gtst). no major engine mods apart from pod, fmic and ebc. bought the pump for the sake that im getting a custom boot done and affraid that it might be a struggle to get the pump in afterwards...

1) will i need to upgrade anything eg fuel lines???

2) is it ok to just replace the stock pump, leave the stock regulator (for now) and install nismo pump??? (ps: will eventually upgrade ECU to autronic one)

3) what about installing the regulator??? i know its adjustable, or can i just leave it off for now till i get injectors and ecu upgrade???

any suggestions appreciated ay...

thanks in advance, Jon

[RB30-POWER]

1) No you will not need to upgrade the lines.

2) Yes you can just change the pump and retain stock reg.

3) If you want to install the reg, you need to measure current fuel pressure and set the new reg to the same pressure. Otherwise it will overfuel. Once you have the bigger injectors and are going to reprogram it, you could raise or set the pressure as you choose.

[Jon88]

1) No you will not need to upgrade the lines.

2) Yes you can just change the pump and retain stock reg.

3) If you want to install the reg, you need to measure current fuel pressure and set the new reg to the same pressure. Otherwise it will overfuel. Once you have the bigger injectors and are going to reprogram it, you could raise or set the pressure as you choose.

sounds good, thanks for your help, so to read the current pressure i need a fuel pressure gauge right? i heard you can just place them under the bonnet correct? and can i then just record the pressure at idle rpm???

[RB30-POWER]

yeah, you can either fit a guage or get your mechanic to hook up an inline pressure guage/flow tester, just for the measurements.

you want to measure two pressures, pressure at idle with the vac hose connected and pressure at idle with the vac hose disconnected.

standard pressure will be something like, 32psi with the vac hose connected (20" vac) and should read 40psi with the vac hose disconnected from the reg (0 psi/atmosphere pressure)

just set your new reg to the measured pressures and you will be able to use it without remapping the ecu, if you plan to fit it before the ecu.

note: pressures are just an estimate used for the above example.

if you got a standard 1:1 ratio reg and set it to the same pressures it is of no real benefit of course, its only a benefit if you want to raise your fuel pressure quickly and easily to either rectify spray patterns on get a little more through your injectors, if they are to small.

at the end of the day, there is no real need for a fpr if you have correctly sized injectors, but it can sometimes be handy if you get stuck.

[Jon88]

yeah, you can either fit a guage or get your mechanic to hook up an inline pressure guage/flow tester, just for the measurements.

you want to measure two pressures, pressure at idle with the vac hose connected and pressure at idle with the vac hose disconnected.

standard pressure will be something like, 32psi with the vac hose connected (20" vac) and should read 40psi with the vac hose disconnected from the reg (0 psi/atmosphere pressure)

just set your new reg to the measured pressures and you will be able to use it without remapping the ecu, if you plan to fit it before the ecu.

note: pressures are just an estimate used for the above example.

if you got a standard 1:1 ratio reg and set it to the same pressures it is of no real benefit of course, its only a benefit if you want to raise your fuel pressure quickly and easily to either rectify spray patterns on get a little more through your injectors, if they are to small.

at the end of the day, there is no real need for a fpr if you have correctly sized injectors, but it can sometimes be handy if you get stuck.

righto, cheers for that ay, didnt realise that really i dont need it but maybe it'll come in handy down the track who knows...

[Jon88]

just another question,

is it possible to change the fuel pump from inside the car? ie through removing the rear seats and then unscrewing the 'fire wall-like'plate that separates the cabin from the boot???

cheers in advance, jon

[tek_01]

to change the fuel pump u need to do it through the boot. you possibly can do it the way u said by removing that plate but why make more work for yourself??

[MANWHORE]

I'm guessing you have a big ricer setup in the boot blocking the way?

In terms of possibility, sort of yes. How hard will it be? very.

The cap is pretty hard to remove. You really want to have as much space as possible to try and do it. Also, the inspection panel is really small, and there's all this crap in the way. You'd be bending aroudn the bend and having no force to open the lid.

Also, I don't like breathing in fuel, so i'd prefer to do it with the boot lid open to have more fresh air.

[Jon88]

I'm guessing you have a big ricer setup in the boot blocking the way?

In terms of possibility, sort of yes. How hard will it be? very.

The cap is pretty hard to remove. You really want to have as much space as possible to try and do it. Also, the inspection panel is really small, and there's all this crap in the way. You'd be bending aroudn the bend and having no force to open the lid.

Also, I don't like breathing in fuel, so i'd prefer to do it with the boot lid open to have more fresh air.

nah, i've just got the floor carpeted and my two subs sunk into the tyre well and have my two amps on a carpet board covering the battery etc.

can remove it though ill need to get it remounted by the audio shop... was just hoping that i could get through the other side. anyway if you advise that it is easier to go through the boot, then ill do that.

cheers

[R31Nismoid]

Definately through the boot mate.

You'll age yourself 5 years trying to do it the other way just because its such a pain