Replacing my low pressure fuel pump has been on my to-do list for a while now and 2 days ago I got the job done. I ordered a VDO pump based on Autodoc's compatibility result. VDO part number for this is
228235070001Z and it came with a black seal ring,
1J0919133B. Initially I also ordered a pump controller module but it was an aftermarket unit, not oem so I decided not to keep it. I may get a new controller sometime next year if I'll have nothing else to spend on. The difference between the new pump and old pump is that the old one has a blue top, the new one has a white top.
The inscription on the pump reads
A2C53107628 and has the production date stamped in that says 2022.
The OEM rubber seal ring was pinched. I made sure to not pinch mine when replacing it. The pump was never changed as it still had the original seal tape on it that was so brittle it broke into pieces when I tried to cut it.
As for the result... Changing the pump made no difference whatsoever. Everything is the same as it was before. Still rough-ish cold starts and air noises every time I open my door after letting the car sit for a few hours. Since it wasn't the pump, i'm moving on to the next step: injectors or my hpfp are leaking.
Around march next year, I'll be replacing my injectors with brand new OEM Mk6 R injectors so I can finish the K04 swap and remap for 340-350hp since I'm remapped for stock injectors now. If that still doesnt change anything, I'll be buying and upgrading a brand new Hitachi HPFP. If still nothing changes, then I wont try anything else since it's just the cold start, no other issues.
