High pressure fuel pump, leaking from bottom of fuel regulator!!

[Yianni]

Is there any chance I can just replace the high pressure fuel regulator as this is where it is leaking from??? or does it mean if it's leaking from the regulator the entire hpfp needs to be replaced. Sorry don't know much about this problem, require urgent assistance or advice?! It's a 2009 gts cayenne, it's only just done 100,000 km on the clock now..

[JFP in PA]

Welcome to RennTech 

I do not believe Porsche sells the regulator by itself, only with the $1300 pump. The pressure sensor is available by itself, however.

[Silver_TT]

You should replace the entire HPFP.  This very problem is the reason I preemptively replaced my HPFP last month.  If you're not changing your own oil so you can smell and feel the oil or doing oil analysis this can be easy to miss.  The HPFP can leak gasoline into your oil and cause fuel dilution.  The pumps were also revised as time went on.

 

I would order a new HPFP using your VIN from Sunset.  Also I don't know as much about the 2009 but I suspect it could use a flat tappet.  If that is the case I would carefully inspect the tappet and camshaft lobe where it makes contact.  Even looking at my roller tappet at 100K miles it had very light scoring and when you shook it compared to the new part you could hear more play, so I replaced it even though everyone says you don't need to.