I have been running two micron Racor on my IDI and 2001 PSD for at least a decade. I got rid of the stock filters on both.
Maybe it's a combination of the old used (and maybe partly clogged) 2 micron filter and an old, maybe slightly weak mechanical fuel pump. Not weak enough to cause a problem normally, but add too much restriction pre-pump and shows up.
It crossed my mind to delete the factory fuel filter and put a 2 micron Racor there instead, but that's too much extra work that I don't care to do. If the 14 micron filter pre-pump stops the shakiness on startups, I'll be happy with it. I like the location too, right next to the oil filter, so it's right there to inspect during oil changes.
It makes be debate putting the fiberglass air dam back or not. Without it, I can easily get under there from the front. I can from the back side but it's much more difficult, more shimmying under to reach it. I have to crawl under from further back than normal, due to the LP tank on the passenger side and the gasoline tank for the generator on the driver's side. Plus the running board right under the cab doors prevent me getting under at that area.
What fuel pump is that you use? The brass looking cylindrical one with the mounting loop. I am tempted to upgrade to electric on the RV. My N/A F250 has the one shown below, put by past owner, and it's been good. I'd need something that is ok with a 085 Turbo for the RV.
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