Use only OEM fuel line. Pay the $2 an inch and be done with it. I've used Pep Boys 30r9 high pressure 100 psi fuel hose and Goodyear 30r9 high pressure hose and both tend to leak and require tightening every couple weeks. The oem hose only needs to be tightened twice per year. I have concluded that most aftermarket hose is slightly too large to fit our lines properly. Don't risk losing your Z just because you'd save a small amount of money on fuel lines.