Q: fuel system maintenance on 2009 Mercury Mariner Hybrid

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How often should the fuel filter and fuel injection nozzles be cleaned by dealer. Can I do it myself?
(2) Answers
once a year on both. unless you have the equipment, you are better off letting a shop do this service. the additives sold in parts stores are not good enough.
you dont need to go to a dealer. any good repair shop can perform this service.

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I think it depends on the miles you drive. The injectors do not need to be clean, but the throttle body is a lot more important and should be done every 15,000 miles. The filter every 30,000.
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