[greg schroeder]

The biggest clue for me to use a larger fuel line was the mechanical fuel pump that came on the engine from Roush was 8AN. I'm not an expert on the topic, but I did switch my Superformance 3/8 inch line and Superformance supplied fuel filter(same as one from Auto Zone for a few bucks) to 1/2 inch or 8AN line from tank pick up to carb along with an Aeromotive 100 micron filter. I also went with a higher cfm carburetor from Pro-Systems, different air filter, headers and side pipes. It was about a 75 wheel HP change all together, so about 475 at the wheels. Without the changes the 3/8 seemed ok, but after I started increasing flow and adding power the top of 3rd and 4th gear would drop off at times even though air fuel ratio was good.


An electric fuel pump might push better through a smaller line, but not sure.