The factory fuel pump will over pressurise the Weber carb and cause flooding and generally make the engine run poorly. Adding a regulator to the mechanical pump will cause the pump to die prematurely so you will need to install a low pressure high flow pump. And if the Weber carb you have bought doesn't have the Weber logo cast into the body of the carb or on the external pump covers, it's a fake. Sorry to see yet another victim. The problem with the 'licensed' copies are from the way they are manufactured. The internal fuel metering galleries aren't jetted and can't be changed due to them being integrally milled into the alloy casting. Doesn't matter what you do to the main jets, it will either run lean or rich...
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