Here I go...have to change fuel supply line.

[SpeeednV6]

Well, I thought I'd be able to change out 1' of fuel line after the fuel filter. I did. Now I got a leak near the left front tire. I knew I should have changed out the entire line! I'm going to replace up to the Saginaw fitting close to the intercooler with e-85 okay'd rubber hose at $7/ft. Should I just change supply with AN zized hose? How much does it cost? What size? Which fittings to where?

 

[John Larkin]

You'll need around 16 feet. Plus several AN fittings and a custom fuel filter. It's going to be expensive.

 

[Pronto]

You could get some 3/8" cunifer line and bent it nicely to fit. You could end the lines with AN flare or compression AN fittings. You'd need a filter along the way too. Or PTFE for E85

 

[SpeeednV6]

How much is expensive?

 

[Pronto]

$3.49 ft for teflon ( http://www.frozenboost.com/product_...=1240&osCsid=2005c77de768ff96f70fd4261e19fc36 ) Then you need the fittings and filter.

 

[BEATAV8]

The fuel line in front of the fuel filter is easy to swap out. I suggest buying a stock replacement line from inline tube or kirbans and swapping it out. Only do the rear portion if you're feeling adventurous. The rear section is considerably more dificult.

 

[SpeeednV6]

stock replacement if I may be running E-85 down the road?

 

[SpeeednV6]

I've read that there is nylon/plastic fuel line.

 

[BEATAV8]

I've read that there is nylon/plastic fuel line.

The steel or stainless steel is fine, no worries. Both are available for stock style replacement.

 

[BEATAV8]

Many run E85 through the stock lines, me included. No worries.

 

[SpeeednV6]

E-85 thru stock lines? 3/8 i.d. line? Okay BeatAV8, what's your fuel system comprised of?

 

[BEATAV8]

E-85 thru stock lines? 3/8 i.d. line? Okay BeatAV8, what's your fuel system comprised of?

I have 2 cars on E85 here's what they got:
One runs stock lines without any mods to them (from inline tube), 80lb injectors and a deatchwerks pump. Log fuel pressure with a transducer, it has beautiful clean fuel pressure at 72-75psi with injectors running up to 75%. It's a high 11's car at 110mph very stock, just a TA49 and a few bolt ons.

2nd car has twin walbros with with 120's and custom fuel lines put together from Jegs stuff. There's a thread about it in the E85 area titled dual feed double pumper. Also log fuel pressure on this car.
I did try runing this car with it's original stock lines and it was capable of generating high fuel pressure at high boost but the pressure was not stable. The fuel line upgrade cleaned up the stability issues.
She runs halfway decent, need to get her to the track after sorting it out some more.

vids of the 2nd car:

http://www.youtube.com/watch?v=L6HXmZt9zlY&feature=player_embedded

http://www.youtube.com/watch?v=eOArg-v3y0A&feature=player_embedded

 

[SpeeednV6]

So why do so many upgrade to -8 supply and -6 return?

 

[BEATAV8]

forgot to mention both cars run methanol injection on top of the e85 when needed. not really part of the fuel system but important too.

 

[BEATAV8]

So why do so many upgrade to -8 supply and -6 return?

I dunno. I try not to do anything unless I see a need for it in the data. I'm an engineer that's just the way I roll.

there's a "ttype" guy on here he will tell you to run stock lines with some holes drilled in a few spots where the saginaw fitting neck down. that probably works fine too but I didn't try it.

i recommend first off getting a fuel pressure transducer and logging the fuel pressure for starters. if you see low pressure issues, then go after the pump and the pump wiring first (wiring all the way to the pump including stuff inside the fuel tank - super important).

I do think the stock supply line is plenty capable of just about any single pump like the walbro or deatschwerks, and even dual fuel pumps if the system pressure isn't unrealistically high to the point where there's a risk of popping the internal pump relief valves.

if you see stability issues then go after the return line. Drill it or swap it out for -6.

 

[SpeeednV6]

Ok...it sounds like I will keep the stock sized fuel lines. Thanks for the input. I didn't want to up the line size if I didn't have to. I still need to get rid if the corroded line. I just might put some rubber in there for now. Next year I may get stock-sizes ss lines.