what type of fitting? you mentioned fuel fitting, is it a banjo-style fitting, but with no tube leading off of it? sounds odd... maybe someone injected something into your chassis and that's plugging it?
i'm being serious now by the way... am i just imagining this or can you get some kind of expanding foam that you inject into the frame for...whatever reason. i can't think of a practical or logical reason to fill the frame other than noise reduction but i dunno. i think i'm thinking of houses but imagining it being done to a car...
i'm tired. caffene might wake you up but it doesn't seem to help with my thinking processes compared to being truly rested.
speedo cable? in the middle of the chassis? what the hell? where does the speedo cable go? front wheels? why would the speedo cable go from the drivers side, back to the center of the car on the passenger side, then to the front of the car. that's a no go for me. but i'm not definite on my understanding of speedo cables anyway....