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I own R2585 which is an R2 w Auto trans. Beginning last summer, under full throttle the engine began running out of fuel. I changed the fuel filter and it was some better. Later, it began to starve for fuel almost every time it was under any load at all. After disconnecting fuel line to carburetor, fuel pump delivery appeared weak, at this point I had the pump rebuilt by one of our reputable rebuilders. I also found that a previous owner had added another filter above the rear end at the line from the tank. After installing the rebuilt pump and changing the filter and checking the delivery from the electric pump under the driver's seat, the fuel delivery will support low load gentle driving. As soon as I get aggressive, it seems to starve probably as soon as the float bowl runs low. At this point the see thru filter bowl between fuel pump and carb will be empty. It's as if pressure from the carb inlet is pushing the fuel back towards the fuel pump, which can't seem to overcome the pressure and deliver a steady supply. Also, the 1/4 in. line from the supercharger to the fuel pump appears to be working. I'm out of ideas, has anyone experienced this problem?