Where is the tank vent line? I get the suck when I open the tank.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

According to the CD shop manual (47-0030)when operating properly the tank could have up to 50mb pressure or 1 to 16mb vacuum! So a "woosh" when you open the cap can be a normal function.To answer your question the vent is under the car on the sedan im pretty sure it on the passenger side a funny looking bell shaped thing. Don

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Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles

Yep, on the sedan it's under the drivers side rear. If you follow the fuel return line where it goes back up thru the floor into the tank, the vent valve will be just a couple inches away from it. It's attached to the metal line from the tank with a short piece of hose - a pair of needle-nose pliers will work to undo the clip and let you pull the whole assembly off.

But if the car has stock tires, unless you're thinner than Twiggy, you'll need to jack the car up on that side to even get to the bloody thing. Another reason I love 205/70 tires.

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Just say "NO" to Ethanol - Drive Diesel

Mitchell Oates
Mooresville, NC
'87 300D 212K miles
'87 300D 151K miles - R.I.P. 12/08
'05 Jeep Liberty CRD 67K miles
Grumpy Old Diesel Owners Club

Are you sure it is the suck . . . and not the blow? Also possible for pressure to build inside the tank if air is getting fed into the return line.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman

No but I ran a bit past the empty light and fill up was only 15ish gallons. 27mpg tho, not horrible for the way I drive.

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Is there a method to test the vent. I never have a vacuum or pressure either for that matter.

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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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