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Ac Delco TP3012 Updated to TP3018.
For any of you who've had a 6.6 liter Chevy Duramax from the beginning and are familiar with the fuel filter changes (TP1298/TP1298A/TP1298B/TP3012). Ac Delco has updated the filter again. This is the offical reason the part number has changed again.
The TP3018 will replace the TP3012 next year. The change involves a minor internal part geometry change, to aid in manufacturing. The performance, fit, function, etc. of the filter will not be affected. GM is instituting a part number change simply because the geometry of a component is changing. I don't think you will be able to tell the TP3012 apart from the TP3018, without cutting them open and taking them apart.