After reading this thread I picked up 10' of 1/8" ID tygon to try on my OM606. Its kind of interesting to see the fuel bounce around inside the return lines at idle. While I was in there I also ditched the leaky plastic crankcase ventilation with brass fittings and rubber hose going to the airbox.
Any fuel leaks tent too pool in the injector wells on the OM606 but the cross over pipe makes it difficult to inspect so I cut the plastic injector cover into 2 pieces for quick access.
