I know I have read info about this in the past but I was unable to find the threads, via search, so I'll as ask... If anybody has a link that answers all my question, I will be most appreciative /forums/images/graemlins/smile.gif Here is what I am going to do: 1987 K5, 305 FI My 25 gallon tank has been puncured so I am going to replace it. I want to put in a 31 gallon tank in its place. 1. Do I need to get a 31 gallon tank from a FI rig (87 to 91) or is the carb version tank the same? 2. Is a Suburban tank the same as the Blazer/Jimmy? 3. Straps are different, I suspect. Am I correct in this assumetion? 4. Is the sending unit different on 31 gallon compared to the 25? 5. Is the top side of the tank the same, like the filler neck, overflow? Or do I need to get parts for those as well? The swap seems pretty straight forward but if you have any advice, or can think of something I did not ask, please let me know.