I had problems running a stock fuel line 3/8 running low of volume on the top end. I tried a Holley mechanical pump, several in fact and had constant valve failures. I went with a block off plate and a Jolley blue electric, then a red electric and could never get them to deliver reliable pressure. I had an oil guage sensor that made ground at 4psi, and set up a light to come on if it made ground. It really helped teach me how I was running out of fuel volume at the top end. I replaced the fuel line with 1/2" and it fixed that problem. Unfortunately I used this aluminum fuel line that would wear through and leak.

I wonder if one could add one of the gas tanks set up with a electric pump in the tank and regulate the pressure near the carb and still be able to use the stock fuel line?? Has anyone tried that?