Stock Fuel Pump Relay In R32

[Rolls]

Where is the stock fuel pump relay in the R32, or is the fuel pump powered and switched internally from the ECU with stock wiring?

Thanks

Edit: apparently there is a fuel pump control uni that has a resistor in it which is where it switches the 12v to 9v at idle, does anyone know where this unit is, is it in the boot?

Edited July 7, 2012 by Rolls

[Rolls]

Just tested this and it only does 9v when priming the pump, does 12v the rest of the time.

What I was going to do was try and utilise the stock 9v/12v switch for 14.4v/12v by using a relay and a different resistor in the unit but unfortunately looks like it only switches to low volts when priming not idle as well.

[samos69]

The dropping relay is a silver box in the boot hidden in the rear guard behind the filler cap. The fuel pump relay is green and located on the back of the boot in between the boot latch and the drivers side tail light.

If you do a search there is a tutorial on earthing the pump to run 14.4v all the time, takes all of 5 minutes to do.

[Rolls]

Yeah I know how to do it, done it before, I didn't want it to run at 14.4v when idling though.

Id say it takes more than 5 minutes though!

[linkems]

at full power 13.5-14+ volt, how loud is the fuel pump? will it sound about as loud as when it is priming with the engine off?

[Moodles2]

Since you are a GTR owner, that is most likely your ATTESSA pump that is priming that you can hear, not your fuel pump.

[linkems]

It's bloody loud, kinda makes more sense now. I have a nismo intank and don't really notice anything while driving around, and anything above idle should give 12v. Extra 1-2v shouldn't make any real audible difference then.

[battery]

Yeah I know how to do it, done it before, I didn't want it to run at 14.4v when idling though.

Is your concern heating up the fuel or something else?

[Rolls]

Is your concern heating up the fuel or something else?

Yep, it isn't really a big concern, but if it was easy to do then I might as well do it.

[Chris32R]

Sort of on topic, has anyone completely removed their fuel speed controller and somehow wired the fuel pump to run without it in place without any issues?

[GTSBoy]

Just leave it in place. The right thing to do is to leave it to do the low voltage thing at idle, and take the high voltage output to switch on a relay and the relay gives the full voltage to the pump. Takes the load off the controller and gives you good V at the pump. Win.

[R32Abuser]

At ~12V I already have issues with what sounds like the pump is "cavitating" with 1/4 a tank of fuel.

Sydneykid talks about it in the following thread:

http://www.skylinesaustralia.com/forums/topic/91993-fuel-pump-direct-feed-rewire/page__view__findpost__p__1660416

[battery]

Yep, it isn't really a big concern, but if it was easy to do then I might as well do it.

http://www.ebay.com.au/itm/Nissan-Skyline-R33-GTST-Modulator-Fuel-Pump-Control-RB25-/280918681936?pt=AU_Car_Parts_Accessories&hash=item41680ee950 Maybe???

[Rolls]

Yeah you can buy aftermarket controllers that do it, that is just the stock one, it is the ECU that controls it so an R33 will do the same thing if run off an R32 ECU

Edited July 12, 2012 by Rolls