Hi all. I removed the HP Fuel Pump regulator, replacing the 2 seals ( a rubber & plastic). They worked but was left with a slight fuel leak, which I thought was from the regulator's gasket. It turned out to be the return fuel line from the injectors where it joins onto the metal pipe above the regulator. It's the original hose and was badly perished. For anyone doing a similar job I advise you to replace the hose. I wish i had.
Lessons learned, I guess.

Hi,

If it is the fuel return pipes, simply replace the whole part 8510322 it's cost less than 50 bucks for the original part.

Regards