Fuel tank floor rust repair

[Markwemple]

Trying to figure out how to repair the trunk floor on the tank side. It needs new metal at the base of the shock tower and along the area between the tank and the outer fender. It's rusted enough that, at best, all I can do is create flat steel, but I know there are lips and so on, there. Any and all help greatly appreciated. 

Edited May 9 by Markwemple

[bergie33]

Here is one of a few recent discussions on repairing this area. Maybe it will help.

 

https://www.bmw2002faq.com/forums/topic/206949-please-critique-this-underbody/?do=findComment&comment=1664283

 

 

[bergie33]

Oh, and you should at least try to recreate the lip that the gas tank sits on. It needs to be strong enough to hold a tank full of 40-50L of gas. 

 

 

[Son of Marty]

Here's the replacement part at W&N.

[Markwemple]

39 minutes ago, Son of Marty said:

Here's the replacement part at W&N.

What are the 4 small pieces and the longer one to the left?

[Markwemple]

1 hour ago, bergie33 said:

Oh, and you should at least try to recreate the lip that the gas tank sits on. It needs to be strong enough to hold a tank full of 40-50L of gas. 

 

 

The strength iss is one of my concerns. Also, does it spot weld to the outer fender?

[Markwemple]

In one of the pics from the previous forum post/thread, I noticed a boxed reinforcement piece. Is that normally part of this area?

[Son of Marty]

The glued in reinforcement is a square light only to meet fed standards. The panel is not welded to the outer fender the gap is filled with a mastic material.

[bergie33]

And I think the boxed area is only 74+.

[Markwemple]

Just now, bergie33 said:

And I think the boxed area is only 74+.

Where can you purchase it?

[bergie33]

You can't purchase it.  You have to make it...or not.  It's helpful for structure, would probably help minimize damage in a 5 mph accident with the big bumpers, but not completely required.

[Markwemple]

3 hours ago, bergie33 said:

You can't purchase it.  You have to make it...or not.  It's helpful for structure, would probably help minimize damage in a 5 mph accident with the big bumpers, but not completely required.

Does it sit between the tank and 1/4 panel or tank and bumper?

[bergie33]

See pic below for reference.  It sits between the tank and the fender.  In the pic below, the fender is at the bottom.  Rear of the car is to the right.. 

 

 

[Markwemple]

I can't find W & N as a parts supplier

[bergie33]

 

https://www.wallothnesch.com/en/