My tank sprung a leak, so now I'm thinking about what it would take to switch to a TBI tank and in-tank pump to support my EFI conversion (83 K5). Right now I have an in-line fuel pump. First, do most people agree that the in-tank pump is better? In a way, I like the in-line pump because I can carry a spare and it's easy to replace. I haven't yet experienced any issue with sloshing or anything. If I decide to go with the in-tank pump, I was looking at this tank: http://www.autopn.com/store/pc/viewprd.asp?idProduct=7467 It's polyethylene instead of steel, which seems good in rust country. Any opinions? Would an 89-91 sending unit be correct (pic below)? I'm not sure I understand what the big pipe is for, any ideas? I understand I need fuel out, fuel return, and vent. What else? Also, will my existing lines connect to this sending unit as is, or will I need to splice in some hose or something? At present I feed off the rigid lines halfway up the frame, then go with rubber hose to the TBI.