When I bought the 1991 D-350, the rear of the fuel tank was about ten inches low, hanging by one strand of twisted barb-wire, around the frame, tank, and cross-member.

The strap was hanging by the in-board bolt, screeching against the drive-shaft.

With the bed off the truck and out of the way, I could finally see what needed fixing.

The strap WAS NOT BROKE; it had simply came loose from its notch in the cross-member bracket.

When I re-installed it in it's proper place, it stayed about two seconds and jumped out again.

It is hard to tell, looking between the tank and truck frame; but, there is an opening between the frame and the cross-member bracket, with the slot for the strap cut all the way to this opening.

About halfway of the slot, the metal on both sides has the merest depression, assumably for keeping the strap in its place.

BUT, the strap can, and did, slip from those depressions and pop out between the cross-member bracket and frame.

The best remedy I could come up with was to take a 4-1/2" long X 1-1/4" wide X 3/16" piece of steel.

I bent it 90* at one inch inside measure.

From the opposite end, I drilled 1/4" holes, centered, at 3/4" and 1-3/4".

From the bottom of the rail, I put the short leg of this ELL-shape in the slot where the strap fits (with the strap already in there).

I drilled the rail 3/16", to match the holes in my ELL.

I tapped these holes 1/4 x 20.

With the short leg of the ELL in the slot, I bolted the long leg to the bottom of the rail.

Now, there is no way that the tank-strap can escape, as my home-made bracket prevents it from being able to get out the bottom.

The strap at the forward end of the tank is an entirely different situation, MUCH more secure, and a lot better design.

I suggest that everyone have a look at their rear tank strap, at the end nearest the rail, and see if it could benefit from this preventative fix, before the tank falls to the ground.