try to remember that upping the fuel pressure on a oem fuel setup i.e.: fuel lines won't help that much. its like hooking an air compressor to a straw. diameter is still to small. add pressure to a garden hose now you have the needed fuel! for most set applications 65 psi is enough flow but injectors are needed as the 480cc just aren't flowing enough. another problem is maintaining the higher psi which a bigger fuel pump is then needed.

sadly theres no single part to fix the issue