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Old 06-10-2005, 11:21 PM
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Join Date: Nov 2003
Location: northern VT
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84 300 TD Question

I was diging around in the spare tire area, trying to push out a dent that the car recieved from some careless owner in the past.

I have removed a tringular plastic rigid bladder like thing which sits infront of the power antenna, between the fender and the spare tire support/tie down. I am assuming it is some kind of vent for the fuel tank... Mine is cracked in two places and one of the hose connections has broken off. I guess my question is what does this thing do? Oh it had a little diesel fuel in it as well, is that normal? Can I JB weld the cracks and call it good? or should I go searching for another one.
46 WDX Power Wagon

84 300TDT daily driver
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Old 06-11-2005, 01:29 AM
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Join Date: Feb 2005
Location: Frederick, Md
Posts: 4,540
Isn't that the expansion tank? Im not too familiar with wagons but thats possibly what that is.

1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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Old 06-11-2005, 02:05 AM
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Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,160
expansion tank it is. Look for one off a '79 maybe 80 300TD. They were made of METAL back then. I have never been able to fix the plastic ones, not to say you might be luckier than I was but the plastic does have a slippery feel to it, plus diesel fuel on it makes for getting a hard surface to stick anything to.
Look for a metal one I highly recommend that as a permanent solution. Without this tank or with a leaking one you are going to have diesel fuel smell in the car as long as the hoses are there, and they are there to take up the expansion that the fuel goes thru when warm.
'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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Old 06-11-2005, 04:04 AM
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Join Date: Mar 2005
Location: Marin county,CA
Posts: 64
JB Weld did great job in my case.

Hi There.
I had the same problem. Here is the thread .
To answer your question, JB weld did great. I sanded it first, then used alcohol to clean and dry the area. I can post pictures of the fix if needed. (That willl force me to find the cable from my computer to the camera.)

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