fuel pressure dropping over time

TT5.9mag said
How’s the fuel filter?

A little dirty, but not terrible
(Of course it is clean now...I'll have to see is that helped)

And cleaned

RustyRatRod said
Well, you have the gauge that's telling you it's losing pressure for "some" reason. Heat is always the first reason I look for, especially if there are "times" when the fuel pressure is good. Have you pulled the dipstick and smelled the oil to see if maybe the fuel pump diaphragm has ruptured?

Oil smells and looks great

Here you can see the way its routed...about as good as it gets, I'd say

(pay no mind to that VDO gauge on the fuel log, it is just there to plug the hole)