What model truck? Fill out your profile or at least give the info.
Based on most likely, and what I can remember...
Obviously, get as much gas out as possible before dropping it. There are hard lines that run down the frame rail, then rubber lines jump to the tank sending unit going over the rail. You may be able to take the frame side of the rubber lines loose before dropping the tank, that would be easiest. If not, put a floor jack under the tank with a 2x6 or similar between it and the tank (may not be necessary if you have the steel skid plate). Remove the brackets from the frame (4 bolts each on the inside of the frame). Lower the tank till you can get your hands to the top and have fun with the lines. You will not have much slack in the lines so you can’t lower it too far. You can also tilt the tank a bit to aid access to the upper side. Sometimes easiest just to cut them, especially if they have been there a long time. There is also a ground wire bolted to the frame, you will need to unbolt it from the frame before you break it. Also the gauge wire unplugs from the sending unit end. If you do have the tank pump, there will be a weather pack plug in the wire above the sending unit. Oh, one more thing, the threaded end of the strap may get hung up in the frame access hole as you try to drop the tank so watch for that.
That's all I can remember. Last one I did (my K30) was easy, I had the bed off. And it’s been years since I did one on a complete vehicle so, your mileage may vary. /forums/images/icons/laugh.gif
