I have traced the problem to where I believe it is the device that locks the fuel door. It seems like it may need lubricated. If I lock/unlock 3 or 4 times the trunk and fuel door start to work ok. If it sits again for 30 minutes in the garage (about 40 degrees) it is then slow to release again.

Does it sound like a vacuum or lubricate issue?

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1986 190E 186K (For Sale)
(Maroon, Tan leather)
1996 C280 Sport 208K
(Brilliant Silver, Black Leather)
2002 CLK430 Sport 45K
(Brilliant Silver, Gray Leather , Birdseye Maple)