Fuel leaks from the pump body are common. Not as common as outright failure, but o-ring body seals as other rubber items are often affected by no use. A 40k 320SL isn't getting driven much and failures of rubber products (the body seals are undoubtably rubber although there is no way to tell without distructive disassembly) is common after 10 years.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician