Chuck,

I have a '72 250 and I'm reasonably sure the hoses are hooked up correctly, but it's a little different than your setup.

I have two control valves on the right fender - the rear valve has two hoses connected, both from underneath the valve and the front valve has three hoses connected - two from underneath and one on the top. The rear control valve/rear hose (hose closest to the cab) connects to the rear carb and the rear control valve/front hose connects to the distributor retard (connection facing the front of the car). The front control valve/top hose (Brownish in color) connects to the front carb, the front control valve/rear hose (red) connects to the distributor vacuum advance and the front control valve/front hose connects to the dashpot on my rear carb.

I have tried disconnecting these and advancing the timing etc., per suggestions on this board, but my car runs better with them hooked up. Hope this helps and is not too confusing.

Ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE