I'd like to ask the form if increasing the fuel supply line to 5/8's from tank pickup to L.P. to I.P., would reduce the starving fuel problem at higher RPM's? Would you replace the return Ln? has anyone done this? I know it won't cure it like a air dog sys. And what is available after market to rebuild/ replace tank pick up to 5/8's, and not drilling new holes in tank? I have liked the research done on this from torktek.com. Thans for lookin at it..

Not if you're planning on using a stock lift pump. IMHO. Also, 1/2" lines are more than enough to keep the LP from starving. Pressure is the key to get the pump from starving.

Stock is 6mm ID... 1/2" (12.6mm) ID which is a bit more that double in size... 1/2" lines typically can keep fuel pressure at about 2-3 PSI fall from idle to WOT. Compared to stock lines which is more like 5-10 PSI drop.

im running 5/8's line and noticed good drop in FP under WOT until i replaced the fuel line from tank to LP with some steel reenforced fuel line from west marine.this stuff is so stable that from idle to WOT i see maybe 2 psi drop, and i say maybe with 60HP injectors and smarty, hauling ___ behind a fully built trans.my advice is to either swap to 1/2 in line from tank to your lift pump and then 5/8's to your VP-44. this way the fass has 1/2's worth if fuel volume to help combat the two lines returning fuel back to the tank, 1 via the return the other through the vp-44.