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Seperate fuel pump wiring/relay Install

darkstar

By darkstar,
in Engines & Forced Induction

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darkstar Contributor

darkstar

Posted
Posted

Hey guys, calling on the gurus out there who have done this before.

Ive got a Bosch intank pump that i want to put into an R32 GTST, but in order to maximise current and performance, i would like to run seperate wiring to the stock pump all the way to power and ECU.

I am told that you need a seperate relay setup and heavy gauge fused wiring. I was thinking of keeping the stock wiring as is and then running the aftermarket pump just incase the pump gets sold or changed back to stock.

Is there a FAQ or Tutorial about doing this? What are your experiences and how did you overcome spefic problems.

Im not an autoelec by trade, but i have done a few custom wiring installs before, just need a circuit diagram witha general direction to where i should be heading thats all :(

My impression is that i need to get the fuel pump on signal from the ECU, switch a relay that powers the fuel pump and presto your pump is on. Fuel pump signal goes off, pump turns off. Everything is grounded nice and tidy back to the battery for optimum performance.

Does the R32 have a current droping resistor prohibiting the amount of voltage that goes to the pump during light loads, like on other nissans?

Thanks guys

--

----

Costa

PHaT MR30 Grand Master

PHaT MR30

Posted
Posted

you pretty much got it on the ball, and if you do decide to put the std back in it doesn't hurt to have upgrade wiring there.

as for the dropping resistor, dunno if the R32 has them, but they are a pain in the arse anyway and you can do away with it, dunno how tho.

Sydneykid Grand Master

Sydneykid

Posted
Posted

I haven't seen differential voltage on R32's. It doesn't matter anyway, since it is only switching voltage. Simply select a suitable relay for the posible range of voltages. I use a solid state relay, not mechanical as it is located close to fuel. No sparks for me.

I run both pumps off the same relay. So it is simply a matter of pulling up the standard wiring harness, plugging the switch wiring into the relay, and then using the harness (I made up) to connect to the pumps. To put it back to standard I just unplug the relay remove the external pump and plug the standard wiring back into the standard pump in the tank.

Hope that makes sense:cheers:

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