So far, no one has replied to my question, so giving up posting in one thread.

In the saga of the plugged vent line, should I drop the tank or run new vent line from the tank fitting and to the outside?

Thank you so very much!

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.

In a perfect world, running a new vent line is the correct answer. On the other hand, I have a client with a daily driver (w126 300SD) w/plugged vent. He stopped by about 7 days ago. It's winter, car's underside is packed with snow, he wants it now & doesn't have time for a new vent line right now because he's leaving the state as soon as he leaves my shop - what do I do? I get a vented cap from another wreck and put it on his tank. He's underway, tank's vented & capped. We'll fix it the next time he's in town (or not). BTW he's put 3000+ miles on it since we swapped out the cap - no issues.

Charlie, thank you so very much for the help!

I have been leaving the cap partly off for at least half that amount.

I didn't know there are vented caps. Would it not be better than running a vent line which might leak?

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.

Bump...

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.

Drill a 1/8 hole in the cap for a vent.

That's what I did on my 83, then shoved a 1/8 o.d. nylon line in it and shoved the other end into the filler door drain.
.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Well, think what I have done will hopefully resolve it.

Thank y'all for the help, though!

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.