N54 HPFP operation and failure reasons 

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

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

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

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.

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

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 ?

This is a similar setup as a pressure washer pump

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

We need an update dude.

Do you think the seals can be replaced?

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

You check this code using obd2 scanner?