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The fuel is pumped from the bottom of the tank but your tank is a saddle type tank. The fuel pump is on the passenger side along with the filler neck so chances are, all of the diesel is still on the passenger side. The driver's side of the tank has a siphon jet pump which then allows fuel to empty into the fuel pump pot where it mixes. I would expect the engine to run a little more poorly and maybe smoke a little more but it shouldn't run much different. It won't damage the catalytic converts or anything else for such a small amount of diesel.