fuel pressure dropping over time

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

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And cleaned

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Oil smells and looks great

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

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

The braided lines will do a pretty good job of keeping the heat away. I would suspect the regulator is funky, or the fuel pump is weak. Even if your parts are new, it can happen. I would bypass the regulator temporarily and see what that does for you.