I think they are original. My 200 has the 38PDSI as well.

5) I think you have a bad case of vacuum leaks, possibly due to warped top carb covers. This will allow the fuel in the bowls to evaporate and it takes a while to fill them, especially if your fuel pump is weak. Are you getting a good squirt out of the accelerator pump tubes? Check this the next time you try to start the car

You might also have a plugged idle circuit.

The switch may be part of the arrangement where the transmission's modulator pressure is lowered at idle. This may not be working correctly. Where do the wires go?

My car starts easily with two pumps and full choke, then quickly back off a couple of clicks.

__________________
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