Very informative answer, Frank. "Depends" is the typical answer for your question. Need to know more about your combination and equipment being utilized. 1/2" line is good if you have enough pump. Hell...we run #12 line from the fuel cell to the pump then #10 from the pump to the regulator. Then, #6 from regulator to carb bowls. We also have a ProStar 500 fuel pump. With a larger line you have to have more pump volume. Most mild bracket race application can get by with 1/2" fuel line from cell to regulator. Just have to have enough pump to push the extra volume of fuel in that line.
was gonna say that! runnin a cell? im using -8 (1/2 ") off the cell to the filter,same to the pump.then ran all new 3/8 tube to the front(all insulated and rubber mounted) then 3/8 line to the reg, and carb. runnin 7 lbs. at idle, wicks up to 9.5 - 10 under extreme load. (and yes, i set the floats accordingly)
...see... Jerry, my answer was ...short and sweet...and will be the same as theirs when they get through talking about it. ...Jerrys' friend Frank...
If you are going to run new line, why not go with the larger? P.S. a lot of tanks only have a 3/8 suction tube.
