Originally Posted by daw_two

Ten is not hoarding!!! Chad owns 3 old diesel MBs. I own 4 (oops, 5, counting the Ponton). I probably could use ten in a week. My current project (in the garage) has multiple leaks, so, there goes 4 (maybe more). I'm hoping this same diaphragm is used on the trunk. What about the fuel door? If so, then that's 6 on every vehicle Chad owns and I own.

So, Chad. Is the diaphragm the same for the trunk, door locks, and fuel door?

Originally Posted by Chad300tdt

That's the piece.



The car started having trouble shutting down and the door locks started to not work properly. I tested everything and it lead me to the fuel door actuator, which I just blocked off until the new pieces arrived.



On my cars they are the same, but I've seen several styles of fuel door actuators and I've seen an older design of the door actuators in w123s as well.

My wagon uses 5 of these and the CD uses 3. I've already had a new actuator get leaks in this piece too, so I wanted to keep a few extra around. It's a quick and easy fix when you have the parts on hand.



I bought them from Rock Auto. I've seen two styles of clamps on the rods. One is a large black plastic piece that the outer section pulls off the inner section. Pushing it down clamps it to the rod and locks the two parts together. The other is a white milky plastic piece that has a clip that pushes on from the side.

Both are removable and allow replacement of the seal/diaphragm. The new seal goes on easier with a bit of lube. I used 303.