same type of connector, same type of hose, right? If so, then one of the lines is the fuel supply line, under pressure [probably 60+ psi], and the other line is just the fuel return line, back to the fuel tank. There's a fuel pressure regulator that keeps the fuel pressure in the rails correct, and releases fuel through the return line as necessary to keep it there.
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doh, keep thinking of gas engines.
if diesel fuel isn't leaking in the area, and you aren't spraying a metal fuel line with sparks so it starts glowing, there isn't much to go wrong. a rubber line, put a sheet metal shield in front of it.
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