420SEL 1990. I went to put gas in it yesterday and the fuel door will not open. Does this operate on vacuum with the door locks? I tried locking and unlocking the doors several times, no luck. Any ideas?

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87 300SDL 278,000mi - RIP
82 300SD 260,000mi - RIP
84 300D 178,000mi - SOLD
90 420SEL 178,000 - Daily Driver

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