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Yes, the fuel door operates on the same vacuum system as central locking. The pump for the system is located in the trunk next to the spare tire encased in a block of foam.
There are a few things that could cause it. First, the door itself is thin metal and the little hoop that the lock pin goes through can get bent which can cause the lock pin to stick. Dirt or other foreign matter can make it stick.
Try pushing in on the door a bit as you unlock the passenger's door. That might take away the friction caused by a bend in the hasp part of the door.
Use the release in the trunk if you have to.
Once you get it open, leave it open and lock/unlock the system several times. Look in there to see if the little black plastic pin moves in and out.
I'd be willing to bet you have a surplus of friction somewhere in that mechanism. Either that or a vacuum leak, but I bet friction.
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-tp
1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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