N54 HPFP operation and failure reasons

Here is my theory on how the HPFP works (based on my observations) and the two different reasons the pumps can fail.

[@nprzz5947]

Glad i found this vid… my 535 n54 ran perfect out of nowhere started dying. Scanned it got 88psi lpfp and read the same on hpfp… i bought an amazon hpfp having similar issue going to try a more expensive one tomorrow.. I have new lpfp New low pressure sensor New plugs and coils I only get codes regarding low fuel pressure on the high side

[@turbospool]

excellent video and very detailed explanations! Thank you!!!

[@jasondominguez8434]

I had to replace mine, found one on a crashed mini at the junk yard for $25 & works perfectly

[@mrlarrybobjr]

Ok cool. Now give me the model of mini/ and part number cross reference ASAP and for everybody else.

[@frankpaul3204]

This is a similar setup as a pressure washer pump

[@mta3562]

Man, bad luck there, these pump are expensive, wonder something else cost it to failed.

[@Joneseys]

I’ve been having a lpfp pressure issue lately start up would be 64 psi and as car warms lpfp pressure drops to around 50 ish psi at operating temp. Last night on a drive my rail pressure dropped to lpfp pressure abruptly and here I am just a weird issue unsure if both issues are related but my rail pressure was normal 700 psi at idle around 2500 on a hard pull.

[@DarkePeak]

When my first pump failed (internal seal failure) it was like that - it seemed to work ok intermittently. But it got progressively worse until the rail pressure was low all the time.

[@Kwstakis90]

mixture control 1 & 2 together and pressure plausibility , i replaced lpfp and filter and still got the codes popping , you believe i should try to replace Hpfp also ?

[@mrlarrybobjr]

Yes, it’s very expensive part.

[@bmwn54_cb67]

That’s crazy never seen this before so what’s are going do send them back?

[@DarkePeak]

Yes, the new one is under warranty

[@mrlarrybobjr]

We need an update dude.

[@mta3562]

You check this code using obd2 scanner?

[@mrlarrybobjr]

Yes. Which scanner he used I have no idea.

[@jackantoun2216]

Do you think the seals can be replaced?

[@DarkePeak]

Yes, but it’s a complicated process that needs to be done in an oil bath

[@jackantoun2216]

@@DarkePeak i hope one day you can make it and share it with us. Thank you for your videos!

[@mrlarrybobjr]

You would think it would idle fine with 6000ish hPa from the low pump but yeah it won’t even idle correct.