Not Ranked
You have your fuel system connected wrong. Lots of people do it, so no sweat. The electric pumps in the trunk are there for the reserve fuel system and are designed to only be used when you run out of gas. The other line is for the main fuel system. The main line goes to the input of the mechanical engine fuel pump. The reserve line goes to a "T" on the output of the mechanical pump. Typically all these fittings are -6. There is no return line.
I'm not sure what you have exactly. The standard Shelby fuel system works fine, and you shouldn't need all sorts of large fittings and complicated fuel lines. There are a lot of 500hp and 600hp Shelby cars running around with the standard setup.
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