Well I visually checked the fuel vent and did not see any obstructions. Any suggestions or what to do next?

New fuel tank cap done

Fuel tank vent no apparent obstructions

Next???

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1999 E300 Turbodiesel

Did you have an ongoing thread on this issue?

If so, I would suggest that you post at the end of that thread.

Some of us are getting old and we can't remember the details of your issue.

yeah if you have a differing thread please bring it back to life.

Blow compressed air either up the line to clear it or pressurize one of the feed fuel lines (not too much) and it should blow it right out.

OR you can do it right, disconnect the line at the tank (the vent) and then blow through the vent line.

My SD picked up a good 4 gallons of fuel tank space (it used to be low) when I pressuirzed the tank to clear the vent