Hmmm. well, I will try some kind of sealent, may be 'seal all' will work... and plan on getting another expansion tank.

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46 WDX Power Wagon

84 300TDT daily driver

Ding.... Light bulb goes on...

Seal-All is incredible stuff. By taking a scrap of old t-shirt material and kneading Seal-All into it, you can literally patch bullet holes in gas tanks.

I haven't seen this stuff in years. I last saw it in a K-Mart automotive dept about 6 or 7 years ago but K-Mart has closed all their stores around here. Do you have a local source for it? I bet you could repair an expansion tank leak with Seal-All.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

http://eclecticproducts.com/sealall/home.asp

Had this exact same issue with the TD. Did a de-grease on the tank, then used a hot-glue gun (set to REALLY hot) with the high-strength glue to fill the cracks and then build-up around it and across the seams to support it better. Hasn't leaked.

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

Anyone know the last year they had a steel tank? I've had all sorts of problems with air getting in my fuel system. Happened across this thread and AHA! Didnt even know I had an expansion tank. Pulled out the spare and sure enough, leaky tank. The lines are all old but not leaking. My tank is leaking form the seam in the plastic. What crap! I dont think this sort of thing is what Mercedes is known for...
Part no. is 1234700189 (for the plastic one anyway) Would the steel tank have a different part number?