Well, looks like the bulk fuel line I bought isn't liking diesel so much, or maybe it's Oregon's B5 mandate. Either way, the lines are leaking and not holding tension when I hose clamp them. A week later they're loose again and leaking fuel out and air in.

Off to read about other options, hopefully something clear.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap