Fuel pressure and restriction test

[DDlighttruck]

I picked up new Fleetguard filters, a ten micron for the Davco and a regular FS2200 spin on. I really want to get after this tomorrow

There is next to no instructions with the fuel pressure gauge. I still find it hard to believe it dropped from 260-ish at the bottom port down to 40 at the top port. If it’s still the same after changing filters and looking for an inlet screen filter I’ll take it in somewhere to get a second set of eyes on it