Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

-8 feed/ -6 return ?

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Old Jan 11, 2014 | 10:39 PM
  #21  
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I could but is it needed? Not to play it safe and waste money on large line that might not be needed i read guys making 800hp on stock lines.
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Old Jan 12, 2014 | 12:20 PM
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Hell, I say go for it. You could always up-size later.
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Old Jan 12, 2014 | 04:14 PM
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Yes but its way easier with the frame out right now!
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Old Jan 12, 2014 | 06:59 PM
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So what do you really want to do? You seem to not like either answer to your question and are now just running in circles.
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Old Jan 12, 2014 | 07:29 PM
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I know personally for my application, with my pump, @ 1125hp / 43psi / forced induction, they recommend a minimum of -8/-8 (I went -10/-8 to minimize pressure drop). The next pump size up they recommend -10/-10 @1400hp / 43psi / forced induction.
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Old Jan 12, 2014 | 08:34 PM
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No circles i just want to do it once! Racetronix says the -10/-8 will not yield anything over the -8/-6 lines using their double pump setup in fact it may hurt it because your just filling a bigger line and that may cost some psi.
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Old Jan 13, 2014 | 12:57 AM
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Was that a setup for 1300rwhp?
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Old Jan 13, 2014 | 01:17 AM
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I was gonnas ask if you meant 93 or e85 by pump gas but then I saw you lived in the same county as I do and that pretty much answered it completely. I would call whoever you bought the fuel pump setup from and ask them or even ask your tuner. I would imagine the -10 would be needed at near 1500hp. I have -8/-6 and mine saw 900+ on e85 when the previous owner had it.
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Old Jan 13, 2014 | 07:01 AM
  #29  
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Yea no E85 around here! I dont have the pumps yet but did ask Racetronix because i will probably use there setup they put out 680LPH at 43psi 13.5v which is good for a max of around 1600 crank then add the boost reference of say 20psi they should handle the job if you add a boost a pump to 16v they produce 820LPH and they say this is all though -8/-6 lines.
Im not going to have this thing making that much power all the time probably keep the boost way down that much on the street is no fun at all so i think i will be ok with the -8/-6 lines they seem fairly sure i am.
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Old Jan 19, 2014 | 07:27 PM
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https://ls1tech.com/forums/fueling-i...lbro-450s.html
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Old Jan 19, 2014 | 11:33 PM
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I'd do the -10/-8 to be on the safe side. I don't think you have any issues with low pressure and dang sure won't have starvation problems.
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Old Jun 4, 2015 | 01:56 PM
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Plastic camaro tank is 3/8" feed and return.

Originally Posted by superiorstyles
let me ask you a question that will help me and Ill answer yours too. I have the 2002 Camaro SS plastic gas tank what are the size of the feed and Return so I can buy the Push on fitting for it?

as for your question I would go 10 / 8 just in case in the future you want more out of your set up. you want to make sure the fuel is there and you don't have to go back and redo the job. you can y the at the rail just to make sure both get equal amount and use the 8an
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Old Jun 4, 2015 | 03:07 PM
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Also, double check hose size with manufacturer.

The Fragola PTFE hose I ordered, -8 has an ID of .405" (closer to -6 than -8) and the ID on -6 is the same as 5/16 (-5)
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Old Jun 5, 2015 | 07:42 AM
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It's common for AN hoses to be smaller than what the actual size is "supposed" to be. Reason being is steel, copper, or aluminum lines are measures by their OD, so the ID is smaller. AN hoses are made so the ID is the same as a comparable sized hard line.
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Old Jun 5, 2015 | 04:27 PM
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Digging up a dead one huh? lol
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Old Jun 6, 2015 | 09:26 AM
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Originally Posted by 6togo
No circles i just want to do it once! Racetronix says the -10/-8 will not yield anything over the -8/-6 lines using their double pump setup in fact it may hurt it because your just filling a bigger line and that may cost some psi.
You dont need -10/-8, but it's bollox that there would be anything negative about it.

But future proofing can never do any harm.

-8/-6 will support a lot of flow though. I've had that with my 2x044's for around 10 years now and no issues.
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Old Jul 12, 2015 | 09:58 PM
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Would a -8/-6 combo be alright for a stock application?
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Old Jul 13, 2015 | 04:43 AM
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Originally Posted by darren roar
Would a -8/-6 combo be alright for a stock application?
If it's stock, why bother changing ?
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Old Jul 13, 2015 | 05:45 PM
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Originally Posted by darren roar
Would a -8/-6 combo be alright for a stock application?
It would be alright, but totally unnecessary. You could do -6/-6 and be fine.
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Old Jul 18, 2015 | 07:08 PM
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I just want to throw this out there.

I recently installed an Aeromotive FP regulator (pn 13129) after the fuel rails on my setup and am still using the stock lines. The return line is 5/16" (similar to -5). At idle, with a Walbro 450 pump, I can turn the FP all the way down to 40 psi which is as low as the regulator will go. This regulator solved my rich decel issues I was having with the stock regulator. So it seems to me that 5/16" return line is adequately sized while on E85, unknown about gas at this time. So, I believe a -6 return line would be a safe bet.
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