Anyone thats had one out, can you tell me if the "fill-tube" was welded to the tank or part of the sending unit? I have a sending unit that I pulled from a Sub. tank that I KNOW someone had at least monkeyed with (fuel lines cut off) so it could have been switched. I saw a picture of one supposedly from a 1990 Suburban, and it had the fill tube as part of the sending unit. I know GM lists them in '85/86 as a different part # than a K5 one, but it would seem really odd for the fill tube to be part of the sending unit instead of on the tank itself like the Blazer. Any insight would be much appreciated.