Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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Others here may have more experience in this, but my first thought would be to replace both fuel filters, Although, I assume you replaced the one in the HFCM since moving an old filter filter to a brand new housing would be stoopid, but you still have to ask...
The next most easy thing to do would be to install a manual gauge and verify at least at idle that the new gauge is working properly. After that you will be looking at checking the fuel lines for leaks and obstructions.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter