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Old 09-15-2008, 11:02 AM
zoehelga's Avatar
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Join Date: Sep 2008
Location: Philadelphia, i.e street parking, no place to work on the car
Posts: 39
Vacuum build up in my new baby


I'm a brand new member to the forum! I just bought a 1982 300D with 190k on her (my first mercedes). She is in great shape overall, the previous owner did a lot of mechanical things when he bought it from the original owner a year ago such as:

New exhaust, complete, from the engine to the muffler
New Upper and Lower front ball joints
New Battery and battery pan
New Bosh glow plugs
Front-end Alignment
New Injector return lines
Replaced the left rear swing-arm (discovered a small hole in the original)
Diesel Flush
Coolant Flush
Oil and Filter
Primary and secondary fuel filters
New brake line
Steering box adjusted within spec by the area Mercedes Dealer.
Mercedes-Benz seat bolsters for the driverís seat.
New Thermostat

There is just one issue with vacuum build up in the gas tank. I have to release the pressure by taking the gas cap off every half tank or so. He told me there is a bell shaped valve under the drivers side that is probably clogged. Has anyone ever had this problem? Any advice would be great...

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Old 09-15-2008, 11:14 AM
dannym's Avatar
I'm not here
Join Date: Oct 2004
Location: Deltona, Florida
Posts: 2,360
There is a check valve on the vent line.

Look under the car, fuel tank is behind the back seat. You will see 3 lines.
Fuel supply
Fuel return
Vent line

I don't think they can be fixed but you can try to soak it in some kind of solvent.
You can temporarily remove it until you get a new one. Just don't fill the tank all the way.

1984 300SD Turbo Diesel 150,000 miles

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Old 09-15-2008, 06:44 PM
Stevo's Avatar
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Join Date: Apr 2002
Location: NW WA
Posts: 6,292
The return and vent lines are on the driver side, check return and supply lines for 'weeping' which will destroy your axle boot.


1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

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