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My mk9 2013 63k Civic has one faulty injector and mechanic says other 3 also have poor leak back. Honda dealer has admitted they never replaced fuel filter at 37500 service, could this actually be the cause and possibly injectors are fine but being fuel starved?
 

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fuel filter would not cause any problems in that sort of mileage, it would have to be over 24,000 miles to be fully blocked. leak back is just a return to fuel tank. on all diesel injectors there will be a small pipe running from one injector to the next and so on untill it returns to tank. all this dose is returns fuel that high pressure pump delivers when injector is off. if there is poor leak back then injectors are blocked or faulty.
im an engine re builder and never came across such problem.
if i was you get just 1 injector fitted and test before replacing the other 3.
 
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