Help oh Gurus of the fuel system

[Maj]

You need to change the fuel system a little to swap to an aftermarket pump, bosch 070 or walbro 392 are both good efi pumps that are not too large, not sure how the reg mounts on the 99-00 so be aware you may need to change that to aftermarket too and do something with filters and hoses, if your not up for all the potential changes just get another std pump
or see if the oiginal one will clean out, sometimes it just needs a flush , or if your carefull about sparks a flush and reverse power the pump out of the bike