i have a walbro 255 on my ls/v with bolt-ons. i have a walbro pump because the car used to be turbo'd. i realize the pump is no longer a necessity which leads to my question

can a walbro 255 be tuned to operate at oem pressure?
will i need an adjustable fpr for oem pressure?

i was about to replace the pump and call it a day but a brand new pump is a little less than half the price of a full tune...

should i just get it tuned now or replace the pump first?