Does anyone know what size o-ring (#126) I should be looking for? Is this one of those odd sized o-rings? Thought I'd check around locally but if I have to order it the so be it. This o-ring was chewed up pretty badly when I replaced all my fuel lines on my 1995 E300. I used an o-ring from a box of various sizes and it is holding for now but I'd really like to have more peace of mind and know that I have the correct sized o-ring in there.

Thanks!

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Part number 128 is: 007603012102 ; 0009975644 Oil Drain Plug Gasket; 12mm Copper Seal Washer; 12x16x1.5mm

The same crush washer is used in a number of different places.

You need two of part number 128. One on either side of the banjo fitting of the fuel line (119) that holds the pressure relief valve (125).

__________________
78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

I actually need the size of the o-ring that goes on the bolt. My thinking is that part 126 is the o-ring, no?

Sorry about the mix up.
Part number 126 is: MB Part Number 0179972248, ELRING Part Number 761.540 or GOETZE Part Number 50-350011-00

Only GOETZE has a size listed:

Brand:GOETZE
Part Number(s):50-350011-00
ProductName:Seal
Thickness [mm]:1,7
Material:
Inner Diameter [mm]:9
Outer Diameter [mm]:12,4

So it looks like an oddball size.

__________________
78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

I appreciate the information.