Here's a shot of the fuel filter setup. The prefilter is just to the left of the primary fuel filter and combined filter housing, with the brown hose going into it.. It's held down by just the one bolt. Once you remove the bolt, pull UP not back on it, and the assembly will pop out. THe filter is 150 micron mesh screening. Hope this helps.

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2004 Ram 2500 Cummins HO
2000 Jetta TDI
1999 E300 (sold)