It is fuel delivery, ...
the fuel return is in the front after the pressure regulator. I do also have issues with that hose, but it is more related to tightness of the clamps than to the hose itself. Yes you need a fuel injected cars fuel hose, but that is not that complicated.
The problem is the size and quality of the clamps, that can not be tied enough. I feel that the main effort for this fix should be oriented to a good selection of the clamp. Bill R. (and believe me, he knows what he does) suggested to use BMW clamps, may be it deserves the investment and have a definite fix for this nasty issue.
Javier
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