how big of fuel line do i need

I have had hot street combos that would lean out with 5/16 and some that would not. Maybe some of the 30 year old lines are rusted on the inside. It is a good idea to replace the fuel line anyway so go with 3/8 alum line and rout it in the factory location. It very easy to do. I have drilled out the factory senders and added a 3/8 pickup to them. (alittle tricky) The aftermarket senders work great but are alittle more costly. The fuel pump should be changed to electric or a high flow holley or carter mechanical with 3/8 fittings. A factory pump has 5/16 fittings so upgrade here as well. I like the mechanical for street use due to saftey and noise issues. In cause of a wreck, a electric fuel pump will not shut off by itself unless an interia switch has been installed or the pump is run off of an oil pressure switch. Mechanical is much easier, jmo Ray