What I did on a 123 is take the fuel sending unit out and wash the tank out with diesel using a hand pump pressure washer. I got allot of crud out that way. Not sure if you can do that with a 126.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"