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#2
08-06-2008, 07:29 PM
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No
Something is clogged,I'd suspect the tank vent.
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'84 300SD sold 124.128 
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#4
08-06-2008, 08:12 PM
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It is designed to have pressure in it,i dont recall the specification.Should the pressure go to high it will vent thru the cap. The tank vent if working correctly will allow air into the tank but not out.This info is in the MB shop manual CD version. My $.02 Don
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Red Green "This is only temporary,Unless it works!"  97 E300D 157000 miles 87 300TD ?141k? miles
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#5
08-07-2008, 12:52 AM
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The tank vent is under the car on the drivers side, just forward the L/R tire. kind of between the sub frame mount and muffler. It`s a bell shaped thing.
The 123 is in the same area. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#6
08-07-2008, 01:09 AM
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how much pressure are we talking about? did the cap blow accross the parking lot, or just hiss a bit?
are you sure it's pressure and not vacuum? a bit of pressure is normal unless it was colder when you took the cap off than when you put the cap on... vacuum is NOT normal.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
08-07-2008, 01:10 AM
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The tank vent (under the tank near the return line, not in the fuel cap) in my W124 (1987 300D Turbo) vents both in and out. There's a spec for each direction. My '87 occasionally has a bit of pressure in it, especially on a hot day with a mostly empty tank. It feels like it is a lot of pressure but it must not be -- I removed the vent and tested it with an air compressor. It was good, about 1/2 psi (???) as I recall. Sorry I don't know what a W126 has but I'd bet it is similar, especially if (per Charlie) the 123 has the same thing.
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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