[Clyde65]

1st off, what is the ls going in?

I used a fuel cell I already had and ran the fuel lines to it, return is 5/16" and feed is 3/8" with the external pump close ( about 2ft) to the tank. actually I used -6 braided fuel line from summit along with connectors and all, but you can do the hard lines just as well.

You can use your existing fuel tank but need to know what the vehicle is.

A tank from FuelCellGuy or Boyds Welding here on the forumn can hook you up with a fuel tank for between the frame rails behind the rear axle too. then you can run the lines like above.

Hope this helps.