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you may also be able to disconnect a line isolating the lock system and leave it open to prevent pushing down one button causing another one to pop up. You will have to plug the line to the rest of the vacuum system to allow for the rest of the vacuum system to still work.
That's what I did on my W123. I am sure you could do something similar on your 300SD.
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Ron Schroeder
'85 300 Turbo Diesel 2 tank WVO
'83 300 Turbo Diesel 2 tank WVO
Some former WVO vehicles since ~1980:
'83 Mercedes 240D
'80 Audi 4000D
'83 ISUZU Pup
'70 SAAB 99 with Kubota diesel
'76 Honda Civic with Kubota diesel
'86 Golf
Several diesel generators
All with 2 tank WVO conversion
LI NY
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