DIY E89 Z4 fuel system - DI only LPFP / HPFP

ShocknAwe

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Jan 24, 2018
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Also worth mentioning I have a full 450 bucket and a spare 535 pump which I was piecing together when our global shit hit the fan last year. If anyone wants it, basically OBO.
 

martymil

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Sep 6, 2017
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Down Under @ madautodevelopments
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the ekp3 can handle the load of the 295 easily but I agree if the bpm4 is the unit to get if you want to future proof it.

As ekp3's are cheap you can always carry a spare in the boot already coded to the car so if you start to have an issue you can easily change it until one can afford a bmp4.

I don't understand why the keep selling the 450lph pumps for our cars, the difference in price is marginal at best and if
your not using the full potential of the pump or lets say 50% of the flow the 295 draws less amps than a 450 at 80% flow which is about
the same flow rate.
 

Asmo

Lurker
Aug 23, 2020
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What power levels are you targeting? Was the stock e89 fuel pump insufficient? I've seen good results on 93 using the stock pump, in comparison with the 3 series pump which can't keep up..
 

fmorelli

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Aug 11, 2017
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E89 Z4 35i, F10 535d
600whp with eMix. Stock pump not going to get there. ethanol requires up to 30% more volume, depending on level of mix.
 
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sjobusen

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Aug 8, 2021
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80E93DC3-D137-405F-87A1-DEA640C0D94E.jpeg

how do I loosen the fueline on this? I am ready to open in to the tank and put in my 295 pump..
 

sjobusen

Lurker
Aug 8, 2021
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Special wrench. Most of the companies that assemble upgraded buckets sell them. Check out PR.

They're on there pretty stoutly, or at least mine was. Wouldn't want to do it without the tool.
Special wrench for the fuel line? I have the tool to open the lock ring already, but think I need to disconnect the black fueling first?
 

sjobusen

Lurker
Aug 8, 2021
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How is the 295 or stock pump working? If I connect + and - wrong, will my pump go reverse then? Or will it not go at all?

Can I test that my pump is working, by connecting a 9V battery?
 

sjobusen

Lurker
Aug 8, 2021
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Why do you want to wire the pump incorrectly?
I want to be sure to get it correct :)

Reading your nice instruction.... " Wire the connector so white/brown and red/black." and this does not make sense to me...

On the 295 pump red wire are +. White is -.
From car I got brown/red +. And black -.

Or am I totally wrong here? o_O
 

Neg89

Private
Jul 4, 2021
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I want to be sure to get it correct :)

Reading your nice instruction.... " Wire the connector so white/brown and red/black." and this does not make sense to me...

On the 295 pump red wire are +. White is -.
From car I got brown/red +. And black -.

Or am I totally wrong here? o_O
So i put the new pup in,and crank but wont start.If i prime with protools i can hear ir but much more silent than before,whats wrong?
 

Krampus

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Aug 8, 2020
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So i put the new pup in,and crank but wont start.If i prime with protools i can hear ir but much more silent than before,whats wrong?
If you can hear the fuel pump priming just crank the car again. Do you have enough fuel in the tank:sweatsmile:?
 

Neg89

Private
Jul 4, 2021
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I put aprox 10liters in after swap,do not know which side of tank it entered.Suguest to put in additional 10liters? Would be mess if need to pull the pump out again.
 

sjobusen

Lurker
Aug 8, 2021
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My pump worked immediately I tried it in car. Car started directly. About + and - I connected as I wrote before, red from pump to red/brown from car, and white from pump to black from car.
Check again that you do not forget any connector...
 

Neg89

Private
Jul 4, 2021
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My pump worked immediately I tried it in car. Car started directly. About + and - I connected as I wrote before, red from pump to red/brown from car, and white from pump to black from car.
Check again that you do not forget any connector...
Wait.Doesnt the morelli stated opposite way?