Testing fuel system

First step is to rig either a temporary or permanent fuel pressure gauge, second step is to look up the specs of whatever pump you are running and see if it will pump the gallons/ time that is specified.

Unless this is a 600hp monster, you don't need a 3/8 fuel line, but you DO need a clean strainer in the tank, GOOD hoses at the interconnects, and make sure the metal fuel line is not gooped/ rusted up inside