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Stock Fuel Pump Relay In R32

Rolls

By Rolls,
in Engines & Forced Induction

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Rolls Grand Master

Rolls

Posted
Posted (edited)

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 by Rolls
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https://www.sau.com.au/forums/topic/404168-stock-fuel-pump-relay-in-r32/
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Rolls Grand Master

Rolls

Posted
  • Author
Posted

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 Enthusiast

samos69

Posted
Posted

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.

linkems Collaborator

linkems

Posted
Posted

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.

GTSBoy Grand Master

GTSBoy

Posted
Posted

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 Mentor

R32Abuser

Posted
Posted

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 Mentor

battery

Posted
Posted

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???

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