The vacuum system on my '83 300D must have a leak - automatic door locks have stopped working. No big deal except that my fuel door will not open. I'm almost empty.

I tried unlocking all the doors by hand. Made no difference.

Is there someway to open the fuel door thru the trunk?

JWJ

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JWJ
1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG
1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG
Biodiesel, Mobil Delvac 1, and Viton fuel lines!

There is a release inside the trunk (on the Starboard side of course) and you have to remove the stiff sideboard liner to get at it. You will need a flashlight.
(only through the Luck of the Irish , Have I not foud myself in your quandry)

Yep on the right side of the trunk under the heavy covering there is a brass colored lever/arm connected to a vac pod etc, pull it towards you(towards back of car) and it will go "thhhhump" and the fuel door will be freed!

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

OK, so I have the opposite question.

Can the fuel lid cover be locked with this same lever/arm?

The vacuum door locking system is disconnected on my 240D and I don't care to fix it at the moment, but I would like to lock my $50 of fuel at night.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

Yes.