I've done some reading and from what I can gather, it's an in-tank filter. I did a search on instructions and haven't really come across anything. Do any of you guys have any input or links to where I might find this info? I'm putting in a GT500 filter for conversion to E85. Also, is there a particular filter that might be better than the other? I see a few of them out there, or is the Ford branded filter A-ok?