The new relay will only fail if the amperage draw of the fuel pump exceedes the limit of the circuit of the relay. The new relay has a re-designed curcuit board that will not fail like the old one.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM