Heard hissing sounds from the fuel filler door's vacuum element. Received the Mercedes replacement part today, but seems the part have been redesigned. The stem is ~1 inch shorter, see pic; left side = new replacement, right side = original.

Due to the shorter stem, the fuel filler door remains LOCKED always.

So looks like some modifications will be required here....

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85' 190E w/collector plates

AND the Mercedes part number for it is:
000 800 80 75
(The triple Zero prefix means it's a Standard Automobile Type Part Generic)

AND it sure does look like the "Incorrectly Engineered/Length Challenged " problem they sold you.

There is mention of a 124 XXX XX XX type part number with a round actuator type housing for
a certain serial number series of chassis. [Only the Shadow Knows]

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'84 300SD sold
124.128

Thanks, that is the exact part# on the pkg. It's a genuine Mercedes part, has Mercedes name & logo on it. It looked identical to mine, till I had them side by side.

Yes, I saw the round actuator one too, I think it's for later models.

I took both of them apart to try to swap just the "rubber seal" from the new part to the original to try to make this work. But unfortunately, the "rubber seal" is molded to the stem....so can't just swap the rubber seal over.

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85' 190E w/collector plates

BUT what will work is if I cut the locking metal rod by ~1 inch.
See pic# 1, closed position...look how far the metal rod sticks out.
See pic# 2, open position...metal rod is STILL sticking out, locking the filler door.

Pic# 3, metal rod
Pic# 4, If I cut/shorten the metal rod by 1 inch...should fix it.

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85' 190E w/collector plates

Finishing off the thread, shortened the metal rod by 1 inch...now works perfect.
Pic#1 - closed position
Pic# 2 - open position

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85' 190E w/collector plates

'Nice Bevel on that finished rod.

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'84 300SD sold
124.128

I just noticed noises from the vacuum filler element locking mechanism this week. Today I put my hand over the locking mechanism immediately after unlocking the car, and could feel air coming from the gas cover locking mechanism (see pic).

Any suggestions on diagnostic next steps before I go through trying to replace the lock mechanism?

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Steven
1989 260E (276K miles)
1995 E320 (50K miles)

#1. We'll Be able to help you more if you'll tell us what year and model.

(Sounds like the fuel filler door element has an air leak.)

See "Cypress's" number three reply description above.

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'84 300SD sold
124.128

1989 260e

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Steven
1989 260E (276K miles)
1995 E320 (50K miles)

Internet access is limited @ present and It's driving me Nuts!

EPC says that the same two "Elements" are used both with the 260 e
Station Wagon JAPAN

and the 300 Sedan 2.8 Liter (U.S. ONLY)

Up to 9 of 1989 the Element is Part Number 129 800 20 75

After 9 0f 1989 the Element part Number is 129 800 25 75

Your VIN Number will determine the correct element @ Purchase Time.

ALSO one of the versions has ANOTHER separate Actuating Rod that the Element acts upon to "Lock" the Door.

First, before you condemn your Element, Inspect it outside the Chassis to make sure a Vacuum/Pressure Hose has not come "Loose".

You'll have to go in through the Trunk, after removing the Felt Covered Fiber Board lining of the Sedan
(I Gots No earthly Idea how to get the S.W.'s Element out.)

Oh! And Y'all Gots P.M. Traffic,Incoming.

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'84 300SD sold
124.128

This is great info, thx very much. Sounds like a nice little project for New Years' weekend.

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Steven
1989 260E (276K miles)
1995 E320 (50K miles)