fuel pressure dropping over time

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)
That filter looks like it has enough surface area to support maybe 300hp. Maybe. Might just be your pic but I can’t see a 408 making good power with a filter that size.