[GeorgeKLT]

Hi guys,

I was hoping you can point me in the right direction to sort this issue out.

I get low fuel pressure error after 3000rpm, usually when I floor it but even if you accelerate at a slower rate, limp mode kicks in.

The car is a bmw e90 318D 2009 with the following mods:

335 e92 intercooler (modified to fit my car)
bigger injectors(solenoid) from N57 engine(bosch code 0445110382)
hpfp from N57 engine / CP4S2 L75 (bosch code 0445010634)
hybrid turbo GT1749V
dpf off

Car went from 143hp stock to 205hp.

I had to modify the fuel rail in order to accommodate 2 fuel pipes from the L75 hpfp.
The rail fuel pressure sensor and the rail fuel pressure regulator came from the donor car along with the hpfp.

I've tested the injectors and the hpfp at a bosch location and they confirmed that they are working fine.

Fuel filter has been changed about 2 months ago.

From what I read on the net about error code 004560 all the items from the fuel system can be at fault so I need to narrow it down.

I recorded live data from when the fault occurs and attached it to this thread.

Also, pre supply pressure from fuel tank is 3.7-3.8 bar (3.8 bar is max pressure)

Any ideas on what might cause limp mode?


Thank you.

[Dsvec]

I had a similar problem with my 320d, but the car completely died on me...
I tested the injectors they were good, replaced the fuel filter, checked the fuel pumps they were working.. then replaced the HFPF still didn't fix the problem.
After a little bit of research I swapped back the original fuel filter then checked the pressure that was coming from the pumps, it was around 3,5 bar... when it should have had 6-8bar anyway the plastics connectors that connect to the pumps weren't connected all the way when I snapped them back on car started up immediately.
My guess would be that it's either something with the fuel filter(don't buy cheap ones) because some of them let fuel either way or something to with the injectors/HPFP also it would be worth checking the rail it self, there might be something wrong with it electronically

[kevinp470]

Hi, im wondering what steps you took to fit the hpfp from the n57 to your n47?
I have a 2009 520d, the cars ECU is remapped and the pump is not able meet the demanded pressure required.

[Andreive]

Originally Posted by GeorgeKLT

Hi guys,

I was hoping you can point me in the right direction to sort this issue out.

I get low fuel pressure error after 3000rpm, usually when I floor it but even if you accelerate at a slower rate, limp mode kicks in.

The car is a bmw e90 318D 2009 with the following mods:

335 e92 intercooler (modified to fit my car)
bigger injectors(solenoid) from N57 engine(bosch code 0445110382)
hpfp from N57 engine / CP4S2 L75 (bosch code 0445010634)
hybrid turbo GT1749V
dpf off

Car went from 143hp stock to 205hp.

I had to modify the fuel rail in order to accommodate 2 fuel pipes from the L75 hpfp.
The rail fuel pressure sensor and the rail fuel pressure regulator came from the donor car along with the hpfp.

I've tested the injectors and the hpfp at a bosch location and they confirmed that they are working fine.

Fuel filter has been changed about 2 months ago.

From what I read on the net about error code 004560 all the items from the fuel system can be at fault so I need to narrow it down.

I recorded live data from when the fault occurs and attached it to this thread.

Also, pre supply pressure from fuel tank is 3.7-3.8 bar (3.8 bar is max pressure)

Any ideas on what might cause limp mode?


Thank you.

Hi! Did you manage to fix this? I have the same problem