[Derek.Hale]

My 328d high pressure fuel pump failed at 124,000 miles exactly. BMW said it was out of extended warranty and quoted me $18,900 to fix it.

For that reason I will be repairing it myself. This is my daily driver until I finish college and plan to keep the car forever, absolutely love my car.

My thought is that if I am going to replace the parts anyways I may as well upgrade them if possible. Darkside Dynamics out of the United Kingdom has a CP4.2 upgrade kit as well as tuning options and upgraded injectors. Any suggestions on this would be greatly appreciated.

For sure I'd like to tune the ecm and transmission within reason for a daily driver. Better power response and milage would be awesome. I'd lean more to a custom tune but am open to suggestions.

I will be doing the repairs and programming the injectors with ISTA. Planning to add a lift pump and additional Donaldson filters that are easier to access and better filtration.

Thank y'all for the help on this project!!

[Enabled]

OH! I sent answer via PM, but I can put a summary here.

I would save money and put in a new BMW pump (as it has loads of revision updates), and get the car working again, reliably. Then a good strong tune would make a world of difference. I would also make sure that the source of fuel is good, as that's what takes out the pumps.

Unsure what lift pump you're looking to put it? The car already has a lift pump, which was good enough even for the larger 6-cyl brothers.

[Derek.Hale]

The lift pump I want to add would be either inline with current feed line or with its own sump on the bottom of fuel tank. Similar to those seen on diesel trucks.

If I can use the pigtail for the current lift pump and only power the new one with the sump that would be perfect. But I'm not sure what kind of amps and if it would cause any odd reading with the ecm.

My reason is that I wanted to add a true water separator and a better secondary fuel filter to prevent another failure due to contaminated fuel. Similar to a fass fuel system for reference.

I'm not certain that I would need the lift pump but it would be nice to ensure there is never a drop in fuel supply or pressure to the high pressure fuel pump.

Pressure gauges would be installed before and after the filters to show what is being produced.

[n00bkiller944]

I bought but have not installed the filter from tune my euro. Might be an option as well to reduce damage if it happens again. https://www.tunemyeuro.com/tme-fuel-...separator-kit/

[bmwPower99]

Add 300ml/10Oz of 2 stroke low ash mineral oil before each fill-up and you won't ever have hpfp pump issues.

[Derek.Hale]

Originally Posted by n00bkiller944

I bought but have not installed the filter from tune my euro. Might be an option as well to reduce damage if it happens again. https://www.tunemyeuro.com/tme-fuel-...separator-kit/

I saw this and it's similar to what I'm wanting to set up. Only addition they have is the bracket really that makes it custom to fit bmw.

Deleting the stock filter location would help make maintenance easier to do as well as have better filtration. Going the dual filter route would be a true water fuel separator and a low micron filter to clean the fuel a lot better than the single stock filter.

[n00bkiller944]

i worry if it will add too much stress on the fuel system with both filters, but I am sure it is fine...

[wankun]

Originally Posted by Enabled

OH! I sent answer via PM, but I can put a summary here.

I would save money and put in a new BMW pump (as it has loads of revision updates), and get the car working again, reliably. Then a good strong tune would make a world of difference. I would also make sure that the source of fuel is good, as that's what takes out the pumps.

Unsure what lift pump you're looking to put it? The car already has a lift pump, which was good enough even for the larger 6-cyl brothers.

Ooh, I was searching about the revisions on the pump that is used for the recall. Can you share some details of the revisions? Is the bucket housing the cam roller still able to rotate, causing the roller to be perpendicular to the cam? Improved coatings to be more resilient against poor fuel quality? Thanks.

[Enabled]

From late 2016 and on, the cam follower on the BMW branded Bosch CP4.x have a fixation screw that doesn't allow it to spin to perpendicular. Also the follower roller changed from 10mm to 12mm, then there are different coatings on the inside and outside (no more rusting head cap, more for aesthetics). There are 20+ revisions. Some are minor (like the plastic cap on top of the head), and some are major, such as a 12mm roller (with a different cam), and different mesh materials and coatings.

The last hpfp recall for the 2017+ cars had to do specifically with the 12mm roller and its coatings.

Interestingly, I have seen that if you buy a non BMW branded Bosch pump, you don't necessarily get revision items.

[n00bkiller944]

Originally Posted by Enabled

From late 2016 and on, the cam follower on the BMW branded Bosch CP4.x have a fixation screw that doesn't allow it to spin to perpendicular. Also the follower roller changed from 10mm to 12mm, then there are different coatings on the inside and outside (no more rusting head cap, more for aesthetics). There are 20+ revisions. Some are minor (like the plastic cap on top of the head), and some are major, such as a 12mm roller (with a different cam), and different mesh materials and coatings.

The last hpfp recall for the 2017+ cars had to do specifically with the 12mm roller and its coatings.

Interestingly, I have seen that if you buy a non BMW branded Bosch pump, you don't necessarily get revision items.

This is good and IMPORTANT information for folks to know as more people start to DIY these out of warranty!

Thanks for the info

[wankun]

Originally Posted by Enabled

From late 2016 and on, the cam follower on the BMW branded Bosch CP4.x have a fixation screw that doesn't allow it to spin to perpendicular. Also the follower roller changed from 10mm to 12mm, then there are different coatings on the inside and outside (no more rusting head cap, more for aesthetics). There are 20+ revisions. Some are minor (like the plastic cap on top of the head), and some are major, such as a 12mm roller (with a different cam), and different mesh materials and coatings.

The last hpfp recall for the 2017+ cars had to do specifically with the 12mm roller and its coatings.

Interestingly, I have seen that if you buy a non BMW branded Bosch pump, you don't necessarily get revision items.

This information is so valuable. Thank you very much for sharing. Looks like the way to go is to get the latest pump design (13517824477 is the P/N used in the latest HPFP recall issued in 2021), and make sure to purchase from BMW instead of Bosch.

[n00bkiller944]

Originally Posted by wankun

This information is so valuable. Thank you very much for sharing. Looks like the way to go is to get the latest pump design (13517824477 is the P/N used in the latest HPFP recall issued in 2021), and make sure to purchase from BMW instead of Bosch.

I would be interested in buying a Bosch one and a new BMW part # and just see how they compare...

OP, keep us updated!

[Danpaulyyz]

$18k for a fuel pump?
Ouch…

[Derek.Hale]

I have been having issues with injectors being on back order in the US. Does anyone have a suggestion where I can get them?

[capt_slow]

Originally Posted by Derek.Hale

I have been having issues with injectors being on back order in the US. Does anyone have a suggestion where I can get them?

FCP has them in stock as of writing.

https://www.fcpeuro.com/products/clo...sch-0445110597

[ssf556]

double post

[ssf556]

Originally Posted by n00bkiller944

i worry if it will add too much stress on the fuel system with both filters, but I am sure it is fine...

I would be curious about this as well. The 328d can only accept the 1 micron filter according to the website.

[ssf556]

Originally Posted by n00bkiller944

I bought but have not installed the filter from tune my euro. Might be an option as well to reduce damage if it happens again. https://www.tunemyeuro.com/tme-fuel-...separator-kit/

Did your system come with the 1 micron filter. I believe a 1 micron is overkill and would love to use a 3 micron. Has anyone checked to see if there is a 3 micron filter available. I wonder if this is a space issue. The 1 micron filter is smaller than the 3 micron filter.

[n00bkiller944]

Originally Posted by ssf556

Did your system come with the 1 micron filter. I believe a 1 micron is overkill and would love to use a 3 micron. Has anyone checked to see if there is a 3 micron filter available. I wonder if this is a space issue. The 1 micron filter is smaller than the 3 micron filter.

Mine came with a 1 micron filter. I have not installed it yet

[n00bkiller944]

Originally Posted by Derek.Hale

I have been having issues with injectors being on back order in the US. Does anyone have a suggestion where I can get them?

Did you end up repairing this yourself? How deep did you got into fuel system replacement? Im guessing you didn't pay the 18k for a full system replacement.

I have been thinking a lot about what I would do differently if my fuel pump explodes again now that I am out of warranty. BMW replaced everything under warranty with mine. If it happened again, I would probably clean the tank and lines v replace etc. just curious what people have actually done with success.

[Enabled]

There seems to be a supply issue with these injectors currently, as reflected by the crazy retail price at the dealer of $750 each. A couple years ago they were as low as $85 each. Then they went up to their average of $220.

The price will get better, as BMW prices fluctuate all the time.


In a pinch, I would get a good used injector set of 4 from an N47 F30/31 Euro 320d or 520d, etc. It must have the F chassis N47!!. When registered in, they will work correctly.

I have bought spare injectors for this reason when the price was good. I also have 2x HPFPs which I used mostly for learning on disassembly.


For what it's worth, preventative measures such as choosing quality fuel stations, additives with cleaning properties (I don't think that they will mitigate issues from water contamination), and maybe a water separator would be excellent.

The sudden failures are from fuel contamination mostly from water.
I've been intending to find a place for a water separator fuel filter, without ridiculous 1 micron sizes that won't even let bacteria pass through.
The 2000-2004 VW Jetta fuel filter cartridge seems to be a perfect choice. It gravity separates water out.


I haven't had a real need to do this prevention, as it seems a good fuel station is enough. However, I understand that stuff happens.

[ssf556]

Originally Posted by Enabled

There seems to be a supply issue with these injectors currently, as reflected by the crazy retail price at the dealer of $750 each. A couple years ago they were as low as $85 each. Then they went up to their average of $220.

The price will get better, as BMW prices fluctuate all the time.


In a pinch, I would get a good used injector set of 4 from an N47 F30/31 Euro 320d or 520d, etc. It must have the F chassis N47!!. When registered in, they will work correctly.

I have bought spare injectors for this reason when the price was good. I also have 2x HPFPs which I used mostly for learning on disassembly.


For what it's worth, preventative measures such as choosing quality fuel stations, additives with cleaning properties (I don't think that they will mitigate issues from water contamination), and maybe a water separator would be excellent.

The sudden failures are from fuel contamination mostly from water.
I've been intending to find a place for a water separator fuel filter, without ridiculous 1 micron sizes that won't even let bacteria pass through.
The 2000-2004 VW Jetta fuel filter cartridge seems to be a perfect choice. It gravity separates water out.


I haven't had a real need to do this prevention, as it seems a good fuel station is enough. However, I understand that stuff happens.

I dont understand why they sell our kit with a 1 micron, why cant I replace the 1 micron filter with a 3 micron.