Fuel Line Sizes.

[r33_racer]

Ive heard alot of different thoughts from varying people about what size fuel lines flow what horsepower.

Does anyone know pretty accurately what size lines can flow what horsepower? I tried searching, but it didnt show up many results.

Cheers.

[4drftn]

my car pushes 300 hp at wheels and i have 5/16 hose (stock size). for a bigger and faster fuel flow the fuel pump and injectors do the work.

[r33_racer]

Im looking to make sure we had adequate flow for about 700-800hp. But a guide for all ranges would be beneficial to alot of people other then myself too.

[sky30]

Yeah, im also wondering if std lines will support 700bhp??

[2BNVS]

i run 600rwhp on standard sized lines, never had any drama;s

[r33_racer]

ive been told that std lines being 8mm or 5/16" will support upto about 500-600hp, over that and you need 10mm 3/8" for something like 800-900hp and as the sizes go up, the hp rating goes up exponentially. eg. 1/2" or 12.7mm will do something stupid like 2000hp. Hopefully someone knows for sure.

[sky30]

i run 600rwhp on standard sized lines, never had any drama;s

]

What fuel pump, and what base rail pressure you using?

[Omurru]

There is a 600awkw GTR down here using standard lines. I think the only reason to go to bigger/screw on fitting is more from a safety point of view, or if you have external stuff the use of teflon lines eliminates that stinky fuel smell everytime you get in your car.

[2BNVS]

sorry i meant 500rwhp i was using a bosch 044 pump, i currently run twin 044's now, its going for tuning in 2 weeks, so ill find out what size the lines are as my mate is doing the build

Edited August 28, 2007 by 2BNVS

[Duncan]

hmm don't know....but nissan were kind enough to put larger diameter hicas lines unde rthe 32 gtr right next to the fuel lines

[ULOOOK]

Over 600hp, duel pumps, duel lines & twin entry fuel rail ftw.

[shanef]

go -8 michael. it's what i've got under mine. makes it heaps easier adapting it to the twin feed fuel rail and dash return hose

[r33_racer]

i have to a degree...but most of it is -6 as thats what i welded onto the std fuel rail. From the surge tank to the new fuel pump is -8 and to one length of the new fuel line is -8 and then -6 to the rail and -6 return to the rail and then to the surge tank. I checked the std fuel lines when i pulled them out and they were about 1/4" id in the steel line with about 5/16" od. New fuel lines are 1/2" id and the -6 is 5/16" id. So going up about 2mm in size should increase flow quite abit...atleast enough for what we want anyway.