hOW DO YOU OPEN THE FUEL DOOR ON A 1985 300SD?

yes i can finally post new messages. I just got the 300sd and filled the fuel tank up 2 times.Before if I needed to open the door,I could open it from the outside. Yesterday I got some injector cleaner and was going to dump it in.I could not open the fuel door from the outside. Is there a latch that you need to release from the inside? What do I not understand?thanks

car doors locked? dont laugh. if your car doors are locked your gas cap will be too. i have done that before, and i have been driving benzes for 20+ years.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

there is no lock on the fuel door is there? I can see the rod you are talking about from the outside.

Yes there is a vacuum lock. It's there to keep people from putting crap in your tank or syphoning fuel out. We're not pulling your chain. I always tell people that it keeps jerks from peeing in my tank. I actually have a candid photo of an old man peeing in somebodys fuel tank.

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1983 300-D turbo
1985 300-D turbo
1959 Harley Panhead chopper
1929 Ford coupe restored
I hang out with Boneheaddoctor at Schuman Automotive OBK#5
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If your doors are unlocked but your fuel cap cover is still locked then you have a vacuum problem. The vacuum on the W126 door lock system is separate from the engine vacuum system. There is a positive and negative pressure pump in the trunk with the spare tire. If it is because of a diaphram failure then you should try other measures of protection . . . no wait, that thought was for something else. If the fuel cover diaphram failed then you can access it via the trunk. First remove the right rear tail light bulb module from within the trunk. Next pull out the right side trunk liner - you will have to bend it down a bit to get it past the top. Once the liner is out of the way you can see the diapham with the approximately 1/8" shaft that slides into a hole in the fuel cap cover. Pull it back. Open door. Fill Tank. Fix vacuum leak.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

thank guys-you learn something new every day

I have to tell you guys that this happened to me...and I went to unlatch from the trunk and found my trunk was locked...so I unlocked it went bak to my gas cover and it flipped right open..now I dont know if this was a vacuum latch giving it up at the same time I unlocked the trunk but it opened all the same....maybe this is a demon that is in this guys car too

You guys were right-unlock the doors and no problem with opening the fuel door-thanks