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Fred,
Since you are a newbie, I say welcome to the group, and I'll be kind, but please see my post on model and year. Up through 1989 MB used a fuel pump relay. Model year 1990 used a MAS unit. Model 1991 moved everything to the main computer. Soooo we need to know the year of your car to be able to help you.
Peter
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Auto Zentral Ltd.
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