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Fuel Pump Direct Feed Rewire.

Cubes

By Cubes,
in Tutorials / DIY / FAQ

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  • 2 weeks later...
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SimonR32
SimonR32

ok i did this today so this may help ppl install a bit easier (note this is for a r32 gts-t, not sure if wires are the same as other models) on a 30amp horn relay (all that is needed for a single pum

Cubes
Cubes

I recently checked the voltage my fuel pumps were receiving. Voltages were consistently around 11.2v's. I zipped down to Jaycar and picked up.... 8GA OFC Red Power Cable x 6m 8GA OFC Black Power C

Sydneykid
Sydneykid

Hi Cubes, glad to see you finally did the wiring upgrade, it's a very worthwhile investment in time and not a lot of money. You are suffering from "excessive size pump syndrome", because the 044 flow

Posted Images

flamboyant__'08 Rookie

flamboyant__'08

Posted
Posted

Has anyone done the re-wire on a Ceffy?

I've followed the first post and tried a few other variations with no luck... All I can do is get the fuel pump to run constantly off the battery not accessory/ignition (ie pump running whilst the car is off)???

flamboyant__'08 Rookie

flamboyant__'08

Posted
Posted

Has anyone done the re-wire on a Ceffy?

I've followed the first post and tried a few other variations with no luck... All I can do is get the fuel pump to run constantly off the battery not accessory/ignition (ie pump running whilst the car is off)???

gotRICE? Veteran

gotRICE?

Posted
Posted

I didnt go quite to the extreme as the OP.

Mine just stopped working one day. No idea why. Pump relay and pump were both getting voltage, but nothing was working.

All i did was disconnect the stock 12v feed to te relay, then take the 12v feed from the 4ws Motor and connected that up instead seeing as the 4ws isnt used. . Tadaaa. Perfect running now. Uses the stock relay and earths. One wire to change.

  • 4 months later...
OMY31T Rising Star

OMY31T

Posted
Posted (edited)

hey guys, im doing this mod atm, and ive been wondering wether this would work or not.

im running a dual stage boost controller off a switch in my dash. im wondering if i run the battery 12v feed to my relay, and then run a positive feed from my dual stage switch to make the relay switch on and off, and then tap the battery 12v feed from the relay into the std pump positive feed would this cause any issues?

doing it that way, i can still run the reduced voltage when im just cruising around the streets on low boost, and if i want to give it a boot full and switch over to high boost(low boost is only 10 psi so the pump will suffice without the extra volts) it will pump the extra voltage from the direct feed into my fuel pump to get the max out of it. this in theory should work, but what im worried about is the extra voltage running back up the line on the stock wiring to the stock relay and causing a problem. it would have been good to beable to shut off the stock pump wiring altogether, but the issue there is when the lines switch there will be a momontary lapse in power to the pump.

is it worth a try or should i just run it at max all the time?

Edited by OMY31T
  • 1 month later...
  • 2 weeks later...
gumflapper Grand Master

gumflapper

Posted
Posted

hey guys, im doing this mod atm, and ive been wondering wether this would work or not.

im running a dual stage boost controller off a switch in my dash. im wondering if i run the battery 12v feed to my relay, and then run a positive feed from my dual stage switch to make the relay switch on and off, and then tap the battery 12v feed from the relay into the std pump positive feed would this cause any issues?

doing it that way, i can still run the reduced voltage when im just cruising around the streets on low boost, and if i want to give it a boot full and switch over to high boost(low boost is only 10 psi so the pump will suffice without the extra volts) it will pump the extra voltage from the direct feed into my fuel pump to get the max out of it. this in theory should work, but what im worried about is the extra voltage running back up the line on the stock wiring to the stock relay and causing a problem. it would have been good to beable to shut off the stock pump wiring altogether, but the issue there is when the lines switch there will be a momontary lapse in power to the pump.

is it worth a try or should i just run it at max all the time?

i guess u could try that if u really wanted to but whatever fuel the engine does not consume gets fed back into the tank anyways... id rather have more fuel then not enough when i "need" it...

  • 2 months later...
Marcus89 Proficient

Marcus89

Posted
Posted

Did this mod yesturday, Have some photos and a diagram if anyones confused to show how I did mine, seems to have improved the car a bit

R33FuelPumpRe-wire.jpg

Relay mounted:

Wires spliced into pump wiring:

So you don't need to take the pump back out and replace that wiring also? I really don't want to do that if i don't need to

89CAL Grand Master

89CAL

Posted
Posted

So you don't need to take the pump back out and replace that wiring also? I really don't want to do that if i don't need to

It would be better to re-do all the wiring, but I didnt want to pull the pump out and play around with the plug in the fuel tank cap etc so I just did it like this

The pump sounds louder so must be getting some extra voltage, no problems so far

Marcus89 Proficient

Marcus89

Posted
Posted

It would be better to re-do all the wiring, but I didnt want to pull the pump out and play around with the plug in the fuel tank cap etc so I just did it like this

The pump sounds louder so must be getting some extra voltage, no problems so far

Cheers mate will do your way and if i have issues rewire as necessary. Not pushing the pump that hard (similar power to what you have

jimBNR32 Rookie

jimBNR32

Posted
Posted

hi newbie here from UK

r32 gtr owner.

could someone tell me what do you do with the old fuel pump plug??

i realise i can either cut for 12v before the plug, or fit a male spade fitting inside the plug on the 12v side to trigger the relay.

what do you do with the plugs negative feed?? simply cover it up with tape?? or does this still need to go to ground also?? (so in total, 3 wires to ground, plug/relay/pump)

thanks

ps, anyone confirm the wire colours for the + and - on the plug on a r32 gtr

  • 4 weeks later...
  • 3 months later...
kosmo90 Enthusiast

kosmo90

Posted
Posted

It would be better to re-do all the wiring, but I didnt want to pull the pump out and play around with the plug in the fuel tank cap etc so I just did it like this

The pump sounds louder so must be getting some extra voltage, no problems so far

Did you use the negative (gray) from the wiring loom as well or just the 12v blue?

Cheers

  • 3 weeks later...
SiR_RB Grand Master

SiR_RB

Posted
Posted

Also my battery in the boot on the drivers side so all my new fuel pump cables are short in length, I'm running a walbro e85 400lph pump

What would be the best size cable to support this pump? 8gauge would be hugely overkill for such short distances?

R.3.2.G.T.R Grand Master

R.3.2.G.T.R

Posted
Posted

i used 8g as i had few meters of spare cable, also make sure +ve and -ve are the same gauge, my one just plugs into the existing pin, wires inside the tank hasn't been touched

Also my battery in the boot on the drivers side so all my new fuel pump cables are short in length, I'm running a walbro e85 400lph pump
What would be the best size cable to support this pump? 8gauge would be hugely overkill for such short distances?

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