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Author Topic: Fuel Lines  (Read 2697 times)

99gsrturbo

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Fuel Lines
« on: July 07, 2014, 02:20:09 PM »
Its that time to upgrade my fuel system, i currently run a walbro 400 with ID 2000, stock rail and stock lines. I have a eagle fuel rail. I have been doing some research and have found that the stock lines are 5/16 feed and 1/4 return. Currently I'm pushing over 500hp to the wheel. Last dyno had me at 485 with gsr cams 18psi and a cat. I'm no longer running a cat type r cams and 24psi. Should i run 6 an feed and return or will 8an feed and 6 return be two large. Since I'm in Germany i would really only like to buy hose once since it will take upwards of 2 weeks to get it here. Really just looking for some advice since I really haven't messed with fuel lines before.
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92CXyD

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Re: Fuel Lines
« Reply #1 on: July 07, 2014, 04:36:58 PM »
Quote from: 99gsrturbo on July 07, 2014, 02:20:09 PM
Its that time to upgrade my fuel system, i currently run a walbro 400 with ID 2000, stock rail and stock lines. I have a eagle fuel rail. I have been doing some research and have found that the stock lines are 5/16 feed and 1/4 return. Currently I'm pushing over 500hp to the wheel. Last dyno had me at 485 with gsr cams 18psi and a cat. I'm no longer running a cat type r cams and 24psi. Should i run 6 an feed and return or will 8an feed and 6 return be two large. Since I'm in Germany i would really only like to buy hose once since it will take upwards of 2 weeks to get it here. Really just looking for some advice since I really haven't messed with fuel lines before.

A thread exist about this already, http://www.realhomemadeturbo.com/forum/index.php/topic,16284.0.html

Good info and picts on it.  :noel:
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99gsrturbo

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Re: Fuel Lines
« Reply #2 on: July 08, 2014, 01:58:50 AM »
That did have lots of good info. I guess my true question is, If i run a -8 feed and -6 return will my pump be able to handle it since my rail is 1/2 anyways, or will just running -6 feed and return be better for pressure and flow? It is a walbro 400 the e85 version, so really its a 450. I run 50psi base pressure. I would also be running an inline filter.
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crxvtec91

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Re: Fuel Lines
« Reply #3 on: July 08, 2014, 09:04:19 AM »
What are you power goals? I seen mid 600's on oem lines in 92+ civic/ teg
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99gsrturbo

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Re: Fuel Lines
« Reply #4 on: July 08, 2014, 12:16:23 PM »
600 is my goal, so in theory i can run stock line, but i would like to upgrade them anyways.
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92CXyD

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Re: Fuel Lines
« Reply #5 on: July 08, 2014, 12:45:41 PM »
Quote from: 99gsrturbo on July 08, 2014, 12:16:23 PM
600 is my goal, so in theory i can run stock line, but i would like to upgrade them anyways.

-6 size lines will work, Spiker was doing a lot more on stock lines.  :noel:
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DraginX

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Re: Fuel Lines
« Reply #6 on: July 08, 2014, 01:11:24 PM »
I've seen clost to 700whp on stock lines before, wouldn't recommend it.
What do you have for fpr, I didn't see no mention of that. We couldn't get much past 550 on stock fpr.
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HiProfile

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Re: Fuel Lines
« Reply #7 on: July 08, 2014, 02:16:54 PM »
A small return line only impacts fuel pressure at idle, rarely. People use the 5/16" line as the new return and get whatever feed size they feel like. As mentioned, 5/16" can still make a lot of power. What kills flow is the OEM fittings and sometimes with E85 so does the filter. The filter issue is more of a maintenance thing after switching.

Since you're using such low base pressure, the pump can deal with a bit of restriction (pressure drop) on the feed line. A 5/16" feed might see 10-30psi higher pressure at the pump outlet vs the rail/fpr, while a firehose setup may only see 2-5psi more. Since the pump will be the weakest link, anything you can do to help flow from pump to rail inlet will carry you a bit further.
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99gsrturbo

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Re: Fuel Lines
« Reply #8 on: July 08, 2014, 03:40:44 PM »
Dragin i have just an AEM FPR on the rail. I think i will just go with 8 feed and 6 return and keep as many bends out as possible. I also know i can run more pressure which is what i have been thinking about bumping to 60psi.
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92CXyD

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Re: Fuel Lines
« Reply #9 on: July 08, 2014, 05:04:16 PM »
Quote from: 99gsrturbo on July 08, 2014, 03:40:44 PM
Dragin i have just an AEM FPR on the rail. I think i will just go with 8 feed and 6 return and keep as many bends out as possible. I also know i can run more pressure which is what i have been thinking about bumping to 60psi.

Also having no banjo fitting in the mix improves flow a bunch.  :noel:
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