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I have two small fuel return lines coming to the tank. One line goes to the top of the tank and the other seems to be going inside of the baffle assembly on the bottom of the tank. This bottom tube is clogged. What are these(2) lines and how can I unclog it?. Any one has any knowledge?. It would be appreciated. By the way Tank is out of the car.
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68 250S, 91 300se, 98 SL500, 450SEL 6.9, 14 CLS550 Past MB's; 300SD, 300E, 300TE, 190E, ML420
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Have you removed the filter in the bottom of the tank already?
I would think that you could try pushing a wire in the tube to see if that clears anything.

the top line is vent and the bottom is fuel return.

here is a online parts diagram.
 
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