can anyone out there help me with what i hope is a real simple fix. my 2000 drz400e carb has on the left side of it what is best descibed as a second fuel pump/accelerator pump? this thing keeps on giving me fits, sucking air. i have taken it off and put it on a flat surface with real fine sand paper and tried to true it up. worked for awhile, and is now sucking air again. my question, do i really need it? is there a real need for it? any help/advice on this would be greatly appreciated. also any little tricks for this year bike would help too.