[Jkflo30]

Hi all, really need some help rebuilding my car. I blew up my original engine 2013 f30 335i n55 and am in the process of swapping in a used motor. The engine I found (also n55) is dropped in but I just noticed the hpfp isn't the same as what I had. I don't really know how to proceed. The confusion is because on the original engine the hpfp bolt holes do not align with the engine I put in. There also looks to be some sort of mounting plate that you would think you could remove but it feels locked onto the motor (blown one). Not sure if it matters but the engine came from a 335xi. Yes I know I have to swap the pans.

I'll attach some pictures to make this more clear.

My question is if I should be looking to swap fuel pumps and adapter plates over
OR
Looking for a pump that fits my car

I'm also unsure what is considered "better" or "newer" because I'm already balls deep in this project and just want to do it right the first time (and not keep redoing everything)

Thanks to anyone that can give some guidance on this.

[thejeremyman9]

What year was the donor engine from? Did it not come with a HPFP? Is the picture the HPFP from your original engine?

[Jkflo30]

I don't know I believe 2012. The guy I bought it from keeps blowing me off

[thejeremyman9]

Dorch website suggests there are some differences over the years, but maybe just harness? https://dorchengineering.com/product...-hpfp-upgrade/

[n55david]

if you bought an n55 out of an E series it's different.

[5w20]

Originally Posted by Jkflo30

Hi all, really need some help rebuilding my car. I blew up my original engine 2013 f30 335i n55 and am in the process of swapping in a used motor. The engine I found (also n55) is dropped in but I just noticed the hpfp isn't the same as what I had. I don't really know how to proceed. The confusion is because on the original engine the hpfp bolt holes do not align with the engine I put in. There also looks to be some sort of mounting plate that you would think you could remove but it feels locked onto the motor (blown one). Not sure if it matters but the engine came from a 335xi. Yes I know I have to swap the pans.

I'll attach some pictures to make this more clear.

My question is if I should be looking to swap fuel pumps and adapter plates over
OR
Looking for a pump that fits my car

I'm also unsure what is considered "better" or "newer" because I'm already balls deep in this project and just want to do it right the first time (and not keep redoing everything)

Thanks to anyone that can give some guidance on this.

That's the vacuum pump. I don't have any experience changing it, but it looks like you will need to access it from the front to unbolt the drive sprocket that is driven by the chain that rotates the vacuum pump, oil pump, and crankshaft. I'm not sure if the front half is different, but I would see if you can swap the rear portion of the vacuum pump that houses the HPFP.

[Jkflo30]

Thanks all for the quick replies. I know the harness has changed some but the major issue is the bolt up pattern. I didn't want to have to take that cover off and play with the chains because I don't want to throw it out of timing. If I got it off an E can I just buy an e series fuel pump? I'm having a hard time finding much info on this caveat

[Jkflo30]

And no the guy I bought the engine from removed the pump before selling it. Left the turbo, took the fuel pump. Makes no sense

[Jkflo30]

I have tried rotating the blown engine and then to try backing off the plate and it won't release. All bolts removed it will come off like an inch from the vacuum pump before it gets stuck

[Jkflo30]

The seller just got back to me it's from a 2012 E90

[n55david]

Originally Posted by Jkflo30

The seller just got back to me it's from a 2012 E90

you cannot use the e series fuel pump etc on the f series. it's just different. it uses the old style n54 setup. it's like a weird hybrid of the n54 and later n55.

[thejeremyman9]

Yeah you may want to pause and evaluate if you can even use the E series N55 in your F series without other changes (harness? DME/coding? etc). It might be more work/time/money than just sourcing a F series N55... not entirely sure.

[n55david]

Originally Posted by thejeremyman9

Yeah you may want to pause and evaluate if you can even use the E series N55 in your F series without other changes (harness? DME/coding? etc). It might be more work/time/money than just sourcing a F series N55... not entirely sure.

this.. I was under the impression that they are just different.

[Jkflo30]

So far the only really obvious differences are that I need to swap the oil pans (the xi being much different due to the front axle drive) and the fuel pump. I am swapping over my DME, am considering replacing injectors. Both the "old" and "new" engines say n55b30a so I know they are the same in that regard. I have a manual trans too so I'm swapping flywheels and what not but that's just nuts and bolts I already had to do it once when I replaced the trans.

So far this is really the only feedback and help I've gotten for this issue. Is there anything you guys can think of that may not be compatible?

[n55david]

Originally Posted by Jkflo30

So far the only really obvious differences are that I need to swap the oil pans (the xi being much different due to the front axle drive) and the fuel pump. I am swapping over my DME, am considering replacing injectors. Both the "old" and "new" engines say n55b30a so I know they are the same in that regard. I have a manual trans too so I'm swapping flywheels and what not but that's just nuts and bolts I already had to do it once when I replaced the trans.

So far this is really the only feedback and help I've gotten for this issue. Is there anything you guys can think of that may not be compatible?

havw the rod bearings replaced two since the oil pan is coming off. e series motors tend to have more of a problem with this.

[Gerardo]

Ever get this figure out, dealing with the same thing.. haha

[Tolo35]

Any update on this..? Running into the same issue

[Tolo35]

I have an f10 n55 engine that blew(looks like your third picture) and bought an n55 from a 2013 335xi (looks like your second picture)

Everything has been going smooth so far but swapping these over was not as easy as I thought it’d be.. any insight at all would be greatly appreciated

[madrrio]

I really wish people would check in w solution. My n55 is out of a 640i (going into f30) and so far I have swapped the oil pickup so I can use my old pan, I am in the same situation and think the best way to approach this is swapping the brake booster and fuel pump (though this requires holding the motor chain in place.

I'll try and message the autonwreckers as they took off the hpfp as well.

[Tolo35]

Originally Posted by madrrio

I really wish people would check in w solution. My n55 is out of a 640i (going into f30) and so far I have swapped the oil pickup so I can use my old pan, I am in the same situation and think the best way to approach this is swapping the brake booster and fuel pump (though this requires holding the motor chain in place.

I'll try and message the autonwreckers as they took off the hpfp as well.

Agreed. Keep us posted! I might just have to swap everything else over and take it to a shop to finish the job.

[madrrio]

So the solution is to remove the brake booster cover. Use a tool to hold the gear in place, remove center bolt and 3 surrounding. Bolts while keeping gear in place and replace the booster/ fuel pump assembly with the one from original motor. If more pictures are wanted I can accomedate.

[Tolo35]

Originally Posted by madrrio

So the solution is to remove the brake booster cover. Use a tool to hold the gear in place, remove center bolt and 3 surrounding. Bolts while keeping gear in place and replace the booster/ fuel pump assembly with the one from original motor. If more pictures are wanted I can accomedate.

Sweet! For those who may be worried like I was, it’s connected to the oil pump chain so you don’t have to be worried about timing.
How hard was it to remove the cover & how did you go about it? Did you have to replace it after?
Did you use a special tool to hold it in place?