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I was at my dealer today and talked to one of the service reps who handles Corvettes. He said that Chevrolet started to put a fuel return line on C6 Vettes part way thru the generation, possible when the LS3 was introduced in 2008 but he wasn't sure. The fuel line goes from the tank to the fuel rail crossover on the engine. Any fuel that is not used is returned to the tank via the return fuel rail which follows the fuel line. He said it could be as much as a couple of galions/hr on an LT1 and more on an LT4 because of the extreme high pressure of the pumps. Lines are now all stainless steel and the fuel and return lines no longer have any rubber type flexible sections due to the high pressure.
He said he had never heard of this problem and if he had been told this, his initial guess would probably be a fitting leaking and following the line to the lowest point before dripping rather than the actual line since that is pretty well protected. I don't know but it kind of makes sense. It 's a large dealer (over 300 Vette sales/yr and this guy has been there a long time.
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