Exactly!!! I fixed it this past weekend. Of the three lines secured to the tank, two were corroded at the tubing support. Unfortunately, I wasn't able to read your post until this morning. I found out through some trial and error that your suggestions were what worked. For all those out there thinking about raising the bed for such a problem let me save you some time. It is worthless because the tank straddles the cab and the access is required under the cab and not under the bed.

The tubing lines looked like a copper alloy. If this is so, where does the rust come from?