The 250CE has D-Jet, so there is no mechanical pump. You do need the electric pump, the ECU, and the relays that control them. You might be able to get away with just the heads, but the whole engine would be better.

We're both nuts. I am getting ready to put K-Jet from a 1978 280SE on my 280C.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe