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Discussion Starter #1
Nice evening together

I hope there are still a few 33er specialists out there.
Specifically, I have problems fixing my tank with the tank straps. They just seem to be a few centimeters too short. If I want to tighten it, it starts to crunch and crack everywhere, it bends the tank on the rear support and even a piece of paper doesn't fit between tank and underbody (see pictures). It is a 905, but I replaced the original Bosch tank with a (replica) Marelli tank from the 907 (according to Eper also built into the 905) including fuel sender and fuel pipes, and I also replaced the original felt on top with 10mm thick foam rubber strips. But that won't be the problem since the tank size and the straps are identically for 905 and 907. Is there any trick? Already thinking about producing new tank straps or installing a spacer on the front screw fasteners.

Thanks in advance and have a nice Sunday.
Cheers
Stefan

Marelli Tank.jpg Rear Support.jpg Fixing Screw.jpg Tank on Underbody.jpg
 

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I have experienced a similar issue on my car. When I re-installed my fuel tank it didn't seem to be possible to fully tighten the front tank strap bolts so that they would be flush with the tank strap. As I tightened the bolts I could tell that there was a lot of pressure on the fuel tank from the straps so I left the bolts with about 10mm of thread sticking out of the body of the car on the underside. The bolts are still stiff to turn so they won't come undone very easily and there is still around 5mm of the bolt coming through the captive nut on the inside of the car. I'm not sure what it would have looked like originally as I forgot to photograph everything beforehand but I refitted the original bolts, straps and fuel tank and that was the only way I could get everything to fit.
 

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Discussion Starter #4
Thanks guys for replying.

@AJN:
Was it a 905 or 907 and was it the original tank with original straps?

@acidco916:
Thanks for the details. I measured a few centimeters more but it’s maybe because I tried measuring on the already fixed tank. Why did you make them new? You had similar issues or was it just rusty?

cheers
Stefan
 

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I know on my series 3 33 one strap is 62cm and the other is 63cm long as I made new straps last week
I'm not suggesting you're wrong but in theory the tank straps should be the same length as far as I know. The mounting points front and rear are parallel (i.e neither is further forward or back than the other) and the sections of fuel tank they secure are symmetrical so the straps should be of equal length (in theory, I might be wrong though). There are two different part numbers for fuel tank straps but these relate to the two different fixings at the rear. On early cars (possibly 905) I believe there were bolts to hold the rear of the tank straps in place, on later cars there is a hook which goes over a clevis pin and there are bolts on the front part of the tank which go into some captive nuts under the rear seat.

@AJN:
Was it a 905 or 907 and was it the original tank with original straps?
[/QUOTE]

It was a 907 with original tank and original straps, they were just being refitted after refurbishment. The problem is that it was about 6 years between removal and refitting and I didn't take photographs of how everything should look.
 

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Discussion Starter #9
I'm not suggesting you're wrong but in theory the tank straps should be the same length as far as I know.
They definitely have different lengths!

It was a 907 with original tank and original straps, they were just being refitted after refurbishment. The problem is that it was about 6 years between removal and refitting and I didn't take photographs of how everything should look.
Okay, thanks. Meanwhile I think it’s original this way.

Cheers
Stefan
 

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Discussion Starter #11
I’ve got it from a German vendor atp-autoteile.de a couple of years back. Looks like they were clean up their warehouse, so I got it for a very reasonable price. It’s not available any longer.
Cheers!
Stefan
 
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