well I was talking to a tech that works for holly and he was telling me " I wish they didn't even make them clear" because apparently just because you don't see the liquid in the filter doesn't mean its not reaching the intake charge in a liquid state. What I DO know is that upon a vapor lock situation, pouring cold(ish) water on the pump, lines and fuel rail causes the fuel to liquify, even to the point where the filter is FILLED with liquid fuel. It takes a good 20 minutes of sitting and running in the heat before it gets too bad to keep it running. So I figure it shouldn't take too terribly much to keep it cool enough to run. So I fugure a finned fuel rail will cause what vapor passes through it to liquify again. I mean it would be esier to design that than a finned pump that would look like a sea urchin on crack!