I would feel better about soaking the vent line from the top of the tank to the drain, rather than introducing any solvent into the tank. Where do you acess the top vent line fitting. Do I need to remove the rear seat back or the rear trunk wall panel?

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My infants:
1984 W126 300SD - 118000K WVO conversion
1979 W116 300SD - 160000K Registerd Classic Vehicle