I'm surprised your car has a MAS unit. By 91 the 300Es had pretty well gone to the single unit that controlled everything. I would look harder at other components before the crank sensor. If you had an early ML, I'd say yes, but MBs in general don't have much problem with the crank sensor. If you do have a MAS, the fuel pump relay is in it, so that's a good bet. It could also be the EZL.

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