I noticed some surface cracking on the fuel line from the HP pump to fuel rail; no leaks, however on one of the hot days on the Scotland run I also had under bonnet fuel smells & the same fuel smell on my hands after touching the outside of the pipe.
Time for a change.
The original flexible fuel pipes came with the kit and spec'd at SAE 100R6 - this appears fine for unpressurised/fuel type parameters - but possibly not ideal in terms of fuel permeation and from my reading not really the right spec for any fuel injection system. All the pipes coming off showed signs of the outer cracking, inside looked fine to the eye - so possibly it was the only HP line which was suffering from permeability?
Researched fuel hose specs. seems like SAE J30R9 is a better bet for an injection system - so decided to replace the lot.
Reasonably straightforward job using the old ones for patterns; the biggest challenge being working space around the built up engine & rear suspension area, and getting the old ones out without spilling fuel everywhere.
Re routed the HP Pump to fuel rail line to give it a larger radius bend while I was at it.
Clearly marked to the J30R9 standard
I changed the rear end flexible lines in a similar way & took the opportunity to replace the fuel filter while I was at it. 9k miles left the inside of the old one black in the bottom half/third. I guess thats either gravity dropping the muck to the bottom, or an airlock in the filter.
At the very least peace of mind.
Useful reference: http://www.volksbolts.com/faq/fuelhose.htm
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