well the tiny o-ring from my fuel-pre-reg, was leaking and i said ok, i call my mechanic and he explains how to do it, getting it off was easy but OMG!!!
TO put the dam thing back in %$#@#
, well after two hours i gave up, now i know why the buick mechanics charge what they do , i almost took out my ar-15 and sprayed it
, now i'm out over some small o-ring 



