Thread: w124 fuel pump relay/mas (1991) question
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Old 10-22-2007, 05:48 PM
brewtoo brewtoo is offline
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Join Date: Dec 2000
Location: AL
Posts: 1,219
That knob is simply a lock. Turn it clockwise to secure the module in the base.
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2012 E350
2006 Callaway SC560
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