Here's some very good information on the fuel system on your car:

Pagoda SL Group Technical Manual :: Fuel / Injection

The 280SL Pagoda has the same engine and system as does your 280se.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"