A couple of things spring to mind here.
1: Are you using brake line for your fuel pipe??
2: Where the rubber pipe is routed around the electrical wiring attached to whatever that solenoid / pump??? is looks crushed/compressed.
Hi friend, I imagine what you mean. And that you tell me thinking that by using this tube, you may not be getting enough fuel due to its diameter. Is that so?
As you can see in the black and white photo, in the book or manual, also use that tube.