right guy's i have been looking through ebay at braided fuel hose my question is if you run a -8 return fuel line how do you down size it to fit the return on the fuel tank

cheers damien

 

Why on earth would you ever use a -8 return ? You building a 1500-2000hp fuel system ?

 

this is what i thought but i asked some tuners and they all said -8 now i didn't ask why not -6 i just asked what would you use

 

Ive only ever been told to use -6 hose on the entire fuel system, feed and return.

 

Maybe better to ask a better tuner.

Hell, even my car doesnt use a -8 return !

 

-6 for supply and return is way more than adeqate, think of the size of that compared to the standard sized pipes , I installed a complete aeroquip system on my car with 044 pump around 2 years ago. The only thing I would do is get the teflon lined hose, I was told that non-teflon lined hose was ok if youre running it outside the car, but it still flipping stinks to high heaven if youre sitting stationary with the fan on inside the car. You shoukd need approximately 10m of hose I think so it's not cheap by the time you get all the fittings. I would try somewhere like Pitrek/Earls to get the fittings from.

 

right so i'll use -6 return then

the only reason im not using teflon is that it don't bend as much as just braided and the braided would fit much neater than teflon

 

Teflon hose is stainless braided.

If the lines are inside the cabin, you'll regret not using teflon. You shouldnt really need to use any tight bends anyway when routing the hose., and certainly the Earls stuff Ive used isnt that bad anyway

 

As above, you get braided hose that is teflon lined, and braided hose that ISN'T teflon lined, they both look the same on the outside, but the teflon lined hose is more expensive.
As for the bends, you shouldn't need to bend it much, if your talking about where it would connect to the pump and fuel rail then you need to use 90 degree fittings to do it properly.

 

yes i know that they are both stainless braid but a none teflon hose has a bend radius of 3.5'' and teflon hos has a bend radius of 5''

and im talking about the bending needed to come of the floor pan to the chassis up past the rear spring then turn to aim for the fuel pump

 

Its totally fine with non teflon if thats all you're worried about, I'll even send you pics, when I get back to the uk

 

Are you not running the fuel lines through the car ?

I've also made all of mine in -6 Teflon...........there is a difference between the fittings for the two differnt types of hose as well.

I bought all my Goodridge fitting from CAM Autos

Best of Luck

 

mine uses -8 feed and -6 return.

Steve

 

If you're running them outside the car, then teflon is not needed. And you could say not preferred either.

I recall speaking to a Bowler guy years ago and he said all these fancy stainless hoses were total rubbish. I'd largely agree. But he said they all puncture far too easily. The only hoses they could use without fear of puncture was proper hydraulic hose.

 

it sort of is what im worried about as i don't want them all over the underside of my car

thanks mate they are being run under the car

the only reason im changing from standard is that ALL the tuners i asked said i would be safer binning the standard pipes as they are restrictive and im fitting a T4 and aiming for near 500bhp

i think i'll follow you on that

where can i get that type of hose

 

Anywhere that sells hydraulic hose lol.

I' not recommending you use it, I'm just saying it is the strongest. It will be larger diameter and wont be as flexible as other hoses due to it's heavy duty construction. And fittings would need professionally crimped.

Although Earls power steering hose would be pretty similar.

I doubt you'll be doing any serious off-roading with the car though.

 

no off roading here

 

Lol you are worried about bend radius and you want to use hydraulic hose !!!! That shit has the bend radius of the earth and is fookin heavy I know as I worked for Pirtek for 5 years and my car was covered in the stuff all gone now used pro gold Teflon lined stainless braided hose and is 1000% neater and 10000000% lighter

 

But the upside is that it will never fail as it has a working pressure of 350bar lol

 

im not up to date on hoses sorry

 

you also need to be careful which braided pipe you buy, it MUST be fuel suitable or it will leak over time, many rallycars i used to prep would come in and stink of fuel constantly and turns out pipe goes pourus when not under load, and fittings can work loose so easy

people oftern mis interprit - sizes, -8 doesnt equate to 8mm internal diamiter

-2 0.08" -2.03mm
-3 0.13" - 3.17mm
-4 0.19" - 4.83mm
-6 0.34" - 8.64mm
-8 0.56" - 14.22mm

my A4 runs -8 feed and -6 return and trust me there fcuking huge!

p.s fuel and oil hoses are 2 totaly different beasts

i.e use airline hose (350psi rated) on a fuel system and it will burst within 5 mins, i unfortunatly found this out after getting my A4 running at 3am for the first time being impatient lol

Sean

 

thanks mate yes i have -6 and -8 hose out in the shed i bought 2 meters of each just to plan what way i was going to route them

 

P clips, i always build customers cars with inside fuel/brake lines but there pure motorsport, if your cars fully trimmed id route outside as you get a lot of vibrating and chaffage, not good is chaffage

you got swirl pot and feed pump before swirl, 044/Aeromotive pressurised etc?

 

Plan very carefully....2m is very short !

 

As above, you`d be suprised how short!

 

i bought 2m just to plan the route when im fitting it will be 4m lengths of -6 or -8 when i decide what to use but at the min i think -8 feed -6 return

 

im only running an 044

 

What makes you think that ?

IMO -6 feed and return would be more than adequate.

I'm using a -8 feed and -6 return which is ample for me.

 

Im in the middle of doing mine with braided. Ive opted for -6 teflon, but im using coated hardline tubing for the underside to replace the standard metal pipes, and fitting the -6 AN fittings onto the ends of the hardline pipes. So the braided section will only be as per the OE rubber lines but teflon with AN fittings on the OE rail. Keeps the cost down a bit and means I can retain the standard fuel line clips under the car as well.

 

if you are using the torques metal pipe adapters look at the max pressure for them as i don't think it is enough to match cossie fuel pressure at full throttle

 

There is a solution to the whole rubbed braided/ teflon braided issue - Use Goodridge 811 hose. Its really light, has a great bend radius and doesn't give off any fumes.

Fittings are twice the price of the goodrige 200 stuff though

http://www.goodridge.net/documents/d...dgeCat_low.pdf

http://www.merlinmotorsport.co.uk/GO...256/index.html

 

what engine spec you running mate

 

Some monster V8 thing in one of those aul Ford Grandads

 

Im just about to do my car and im getting the bits bit by bit as ive had to mod my fuel rail and getting my tank done. Im going -6 from the tank to the rail then back to the tank. The rail and tank have been modded by andy robinson race cars he told me to use teflon braided as that is what he recommends and uses on the drag cars he builds so carnt be that bad lol

 

that old green one that ran at TOTB?? :O

not zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz`s one i know

 

http://www.youtube.com/watch?v=0g70tTv255A

 

What the max Fuel pressure at full throttle?? Think the fittings are rated a little over 7 bar. If its more than that, i will have to get the weld/brazed fittings.

 

i didn't say teflon is bad only it woun't bend as tight as non teflon

 

If it's a simple compression fitting adaptor, they are generally only rated to about 25psi. They do hold a lot more though, but they are not a good solution. And if the hardline tubing is soft, they are a bad solution.

A last resort option IMO.

 

Goodridge hardline has a working pressure of 95 bar (burst pressure 290 bar), i assume the fittings are designed to work to the same spec?

I'd actually considered this for the underside of my car as its alot easier to run and i think it'll secure into the standard fuel line clips - hopefully