
This is one of two fuel filter/water separators that need to be replaced together. The other is on the left side of the engine. This is under the bed next to the fuel tank and has a water separator screwed into its bottom which needs to be pulled off, drained and then unscrewed before unscrewing the filter part. The small seal is for the separator. I also read that you should NOT fill the filter with fuel before screwing it back on. This filter is easy to replace, but it's also easy to get fuel yourself. There is a video that I found easy to understand and very helpful. Search "Cummins Fuel Filter Replacement" on Youtube.

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