Johnscars, its good to hear the problem was, well simple, and we all overlook the simplest things from time to time.
SLS is Self Leveling Suspension
Yes gasser wagons use the same pump, in case you ever need one.
DDH

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!