[johnneilson]

I mounted a15 gallon rectangular tank behind the seat
Plumbed hardliners up to pump mounted on passenger side frame rail
Using Holley 1-4 psi pump into a 94 carburetor

The pump you are using is overwhelming the float and needle valve
The original carbs were designed for gravity feed
On racing karts with motorcycle carbs we used to make a bypass type fuel feed
It supplied fuel to carb but not pressurized the return line creates enough restriction that the carb will feed without flooding

John