| This is just an informal write up to my fuel line research and replacement that I am doing. I searched on here and many other places to put this together, so I thought I would post this as a refrence for anyone else doing a fuel line replacment in the future. I don't claim to be a Z guru or know everything about fuel setups. I just thought this might be helpful. Thanks Lets start with fuel line measurements for replacing stock lines with hardlines intact. These are basic measurements, not exact.
4.5inches fuel line connecting the two rails.
 2.5inches fuel rail to pressure regulator, and I think the regulator is connected backwords in this pic, not my rail.
 2.5inches fuel damper to fuel rail
 2.5inches fuel regulator to hardline
 7.5inches fuel damper to hardline
 13.5inches X2 for the fuel filter and return line going to the hardline.
 2.5inches fuel filter line to hardline going back to the gas tank
This adds up to a total of 49inches or 4.08feet. you may want to purchase and extra 6inches or so for adjustment or cutting errors.
If you want to replace the hardlines with hose, this will require an extra 11inches of hose per hardline. This adds up to 71inches or about 6feet in total line. Now on to hose quality. Nissan factory hose is a high pressure line which sells for an average of 1.55per inch. You can replace this with a high pressure line from your local car parts distributer, but first lets find out which hose will perform the best. 5/16" is the size you want to get for the Nissan fuel rails. Most fuel lines are given an SAE rating depending on the strength and quality of the hose.
Ratings:
SAE J30R7 50PSI max operating pressure 175PSI minimum burst pressure
SAE J30R9 125PSI max operating pressure 900PSI minimum burst pressure
SAE J30R10 rated for use inside fuel tank. This hose will not break down from raw fuel exposure.
The earls stainless braided hoses have diffrent ratings that can be found here [ [ http://www.fluidsystemseng.com/ ] ] The stock twinturbo operates at a pressure around 40-45psi. So the cheaper hose will probably not burst right away, but you run a chance of failure and premature wear. Also on Goodyears website they issue a "Warning" to only use SAE J30R9 for fuel injected vehicles. The J30R9 hose will also withstand ethenol and methenol blended fuels. This info can be found here [ [ http://www.goodyearbeltsandhose.com/cars/inject.html ] ] This is the hose I purchased at AutoZone for about $4 per foot, and I recomend the SAE J30R9 for any replacement on a fuel injected car.
 And here is a pick of the inside of the hose. This is very high quality stuff and fits very snug on the fittings.
 Now on to clamps. If your going for the stock replacement and look, then I recommend these type of clamps [ [ http://www.amazon.com/Ideal-Fuel-Injection-Clamps-range/dp/B000EBOPII/ref=sr_1_7/002-0301323-0957651?ie=UTF8&s=automotive&qid=1175308869&sr=1-7 ] ] They fit very tight and give it that stock apperance. For another route you can try this, which is what I am doing. I am covering the goodyear 5/16 line with braided stainless steel by spectre found here [ [ http://store.summitracing.com/egnsearch.asp?N=700+400068+115+4294812878 ] ]
Then for the clamps I am using the spectre part # 2168 5/16 hose clamps.
 
You can also choose to run the earls type fittings and lines, but these are AN sizes, not the 5/16" and usually require fittings to connect them. This can be a costly, but a very nice setup. That is all I have for now. Thanks for reading.
"Speed costs money. How fast can you afford to go". -DarkZide 
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Fuel line 101..... - 
