... So i asked the question on another post of what should be the interval on the alternative fuel filter for the 612...20k seems to be the consensus but here we are...luckily i am a pro at swapping that thing now...Thanks Everybody!
Even a conservative fuel filter change interval won't completely avoid problems caused by contaminated or off grade fuel. A 20k mile filter change interval won't necessarily protect from a 12k mile early fuel filter loading up vs a 40k change interval.
It can be argued that a fresher filter has more tolerance, but your one off 12k filter change example would probably happen anyway, if it was plugged.
Can we be absolutely certain that it was a plugged filter, and not air in the system? Maybe the filter change changed sealing on the system? Might be worth cutting the filter open for visual inspection to provide another data point.
vic