shudders in reverse

While installing an engine I changed front pump seal & bushing in my FMX, now it shudders in rev, @ redlight is like in N till I rev & rev, then jerks

Does the pump bushing have a drain hole I should have lined up? Also, I got a new filter kit, but this one has a fabric type filter & the one I am running is brass. Which do I need? thank ,Jim Masters