[Arctic]

Originally Posted by ex250

Just dismantled the fuel high pressure regulator and not seemed quite clean:






Also, there is some wear on the down side, perhaps by resonance?







Also expected a big o-ring in the insert, and was empty, should not be one?

HI Javier.
Yes it looks like the nylon O-ring is damaged, some do not have the large black O-ring, the replacements do and I always fit them, as above purchase the O-rings to fix