[unclebilly]

What diameter are these lines? They look pretty big in the initial photos.

Do you think you could push Tygon tubing or something similar through your lines (some of those bends do look tight).

If you did this, you could put in a in tank fuel pump which would allow for sufficient fuel delivery (pushing through the smaller diameter hose instead of trying to suck through it).

One of the best parts of fibreglass is that it is infinitely repairable. I would be be afraid to cut into it to make this repair but I would certainly replace the hoses with instrumentation tubing (stainless) as opposed to rubber.

This type of thing is pretty normal in boat repairs. Materials are the same too. A $30 endoscope from Amazon will be your friend here.