Since my Jimmy is on it's lucky 13th year I figure I should prepare myself for replacing the fuel pump when it goes out. I want to cut an access hole in the floor. For those of you who have done this could you give me the measurements for where the hole should be (from the tailpan and from the floor sides next to the quarter panels). Also, how did you make the hole and how worried should I be about cutting next to the gas tank? Opinions on replacement pumps are also appreciated.