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[M35] Deatschwerks Fuel Pump Install

bigkevracer
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scotty nm35 Grand Master

scotty nm35

Posted
Posted

You want to re-thread the tank? It is just the screws that strip I think, just get some off a v35 wreck or something? I have a few here if you get stuck.

I have to look at redesigning my fuel system, specifically inside the tank. I need an in-tank surge assembly using another pump to feed the twins in some kind of container, hopefully that will allow me to run the tank to a lower level without running lean around corners.

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Reprieve Community Regular

Reprieve

Posted
Posted

Dose anyone else s pump have 3 positive wires and 3 negatives all joined up like this? also sounds like the pump ramps up and down according to throttle position?

snBEm1h.jpg

this is what i ended up doing have a few things i want to run in the back so figured id put a bigger cable in.

XmpsPmd.jpg

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

You want to re-thread the tank? It is just the screws that strip I think, just get some off a v35 wreck or something? I have a few here if you get stuck.

I have to look at redesigning my fuel system, specifically inside the tank. I need an in-tank surge assembly using another pump to feed the twins in some kind of container, hopefully that will allow me to run the tank to a lower level without running lean around corners.

You shouldn't need another pump if you can make something to contain your pumps that has one way gates on it (to let fuel in but not out - similar to the one way system on some sumps)
scotty nm35 Grand Master

scotty nm35

Posted
Posted

i was going to use it to turn the pump on and off with the old power cables

Looks good Dale, the stock pump does indeed drop voltage at idle and cruise to limit the flow, so the fuel doesn't overheat. Unfortunately the new pumps require more voltage, hence the need for the rewire. Are you mounting the relay under the seat there? What happens if a big bloke sits there, does the seat touch the relay?

Did you use the DW300?

Commsman Veteran

Commsman

Posted
Posted

Dose anyone else s pump have 3 positive wires and 3 negatives all joined up like this? also sounds like the pump ramps up and down according to throttle position?

this is what i ended up doing have a few things i want to run in the back so figured id put a bigger cable in.

Is that the stock pump you are running?

If so, be careful putting it on full 12V power. I know others have & not had a problem, but that was how I popped my motor. The pump would intermittently make a noise (sort of a buzz) & I suspect when that was happening it wasn't pumping right. I found out by going wot & the rest is smoky, rattly history.

Reprieve Community Regular

Reprieve

Posted
Posted

Looks good Dale, the stock pump does indeed drop voltage at idle and cruise to limit the flow, so the fuel doesn't overheat. Unfortunately the new pumps require more voltage, hence the need for the rewire. Are you mounting the relay under the seat there? What happens if a big bloke sits there, does the seat touch the relay?

Did you use the DW300?

yep i used the DW300, went in easily enough. so you reckon i can just pop the relay on and energize it off the old feed then the pump will run full ball all the time when the car is on, this is ok for the car/pump? atm its just running off the stock cables. yep it touches the seat a little it lines up with one of the box sections under the seat tho. if i sit on it i cant feel anything and im a 100 odd kgs or so haha

Reprieve Community Regular

Reprieve

Posted
Posted

Is that the stock pump you are running?

If so, be careful putting it on full 12V power. I know others have & not had a problem, but that was how I popped my motor. The pump would intermittently make a noise (sort of a buzz) & I suspect when that was happening it wasn't pumping right. I found out by going wot & the rest is smoky, rattly history.

nup its the DW300 been in a few days running off the stock power cables seems all good so far

Reprieve Community Regular

Reprieve

Posted
Posted

^ OK, all good. Do you notice it running richer at all?

yep its running quite rich atm but its always been like that i haven't noticed it change much so far with the new pump. needs a tune and a ecu for that matter lol! still searching for a fcon harness

scotty nm35 Grand Master

scotty nm35

Posted
Posted

^ OK, all good. Do you notice it running richer at all?

Why would it run richer? Surely the stock fuel pressure reg can keep up...

Definitely something you want to do before a tune, I have seen so many people fail on the dyno due to fuel supply issues and not having the pump hardwired, such a waste of time and money.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Good luck with the harness! What if I was to say there is a better alternative out there.

Better option? I wouldn't go that far yet... I am still learning the myriad of options the Fcon has to suit our cars, if only there was HKS factory support, like they have in NZ...

Footo Community Regular

Footo

Posted
Posted

Better option? I wouldn't go that far yet... I am still learning the myriad of options the Fcon has to suit our cars, if only there was HKS factory support, like they have in NZ...

Yea scotty!!!

Jetwreck Grand Master

Jetwreck

Posted
Posted

Better option? I wouldn't go that far yet... I am still learning the myriad of options the Fcon has to suit our cars, if only there was HKS factory support, like they have in NZ...

maybe talk to Stupidious!.....sorry Sidious!

I'll use my local support. :P

Commsman Veteran

Commsman

Posted
Posted

Why would it run richer? Surely the stock fuel pressure reg can keep up...

Definitely something you want to do before a tune, I have seen so many people fail on the dyno due to fuel supply issues and not having the pump hardwired, such a waste of time and money.

Dunno, but I noticed mine was a little richer when I put the stock pump on full 12V (at least when it wasn't buzzing).

Reprieve Community Regular

Reprieve

Posted
Posted

Better option? I wouldn't go that far yet... I am still learning the myriad of options the Fcon has to suit our cars, if only there was HKS factory support, like they have in NZ...

What is this factory support you speak of haha

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