chicago91

Hi everyone, nice forum you have here. I was wondering if anyone knows about 91 pathfinders? Mine has some issues. It has always smelled a little like gas from the outside; inside the truck it's undetectible. I had figured this to either be a rotting fuel line or a rotting gas tank, however it never leaks any gas. That is until recently. A week ago the temperature dipped below 20 degrees in Chicago, and when I started up the pathy one morning it reeked of gas. Shutting off the air vents did nothing to make the gas smell go away, and I do have a bad A-pipe to begin with, but when I popped the hood I saw a leak from one of the fuel lines leading to one of the "front" the injectors. I shut the engine off right away. My question is, how hard is it to change out a fuel injector and/or replace the fuel lines? Do I have to bleed the fuel system like I bleed the brake lines? Also, how hard is it to change out the fuel filter? It's a 91 pathfdiner SE with 150,000 miles on it, 4x4. Thanks in advance for any input.