LS Engine fuel feed system - The 1947 - Present Chevrolet & GMC Truck Message Board Network

structures · 07-09-2010, 10:36 PM

I have a 2006 4.8 ls engine and it only has one line at the fuel rails, the feed line. There is no return line nor is there a regulator. See below.

So I understand the factory fuel pump has the regulator, filter and pump all in one unit. Below is an airtex E3609M. Which is like an OEM replacement.

So if the OEM pump has the regulator, filter and pump all together, why are there return lines in the top?

usmcchevy · 07-09-2010, 11:04 PM

I'd have to go crawl under a truck to tell you for sure, but I'm pretty sure those extra outlets just connect to the charcoal canister in front of the tank.

68GMCCustom · 07-09-2010, 11:19 PM

GM swapped from a return type, to a returnless fuel system in '04 I think.

Jim_PA · 07-10-2010, 10:00 AM

Quote:

Originally Posted by 68GMCCustom

GM swapped from a return type, to a returnless fuel system in '04 I think.

Too much emissions when pumping the fuel up to the hot engine, then back to the tank

And I'm going to run a Corvette style filter/pressure regulator in front of a Walbro 255 inline pump, with an Earls 70micron filter between the pump and the tank. All plumbed with -6AN Aeroquip socketless hose.

And I bought an Earl's -6AN bulkhead fitting to attach to the stock sending unit for a return.

structures · 07-10-2010, 10:12 AM

Quote:

Originally Posted by usmcchevy

I'd have to go crawl under a truck to tell you for sure, but I'm pretty sure those extra outlets just connect to the charcoal canister in front of the tank.

Oh yeah I forgot about the EVAP system... My brother in law has an 05 I'll check it out some time.

Quote:

Originally Posted by Jim_PA

Too much emissions when pumping the fuel up to the hot engine, then back to the tank

And I'm going to run a Corvette style filter/pressure regulator in front of a Walbro 255 inline pump, with an Earls 70micron filter between the pump and the tank. All plumbed with -6AN Aeroquip socketless hose.

And I bought an Earl's -6AN bulkhead fitting to attach to the stock sending unit for a return.

I want to go with an in tank pump but if I can't figure this out I'll probably also go with the corvette filter/regulator.

structures · 07-10-2010, 10:32 AM

Quote:

Originally Posted by Jim_PA

All plumbed with -6AN Aeroquip socketless hose.

Hey thanks this stuff looks nice. No bulky hose clamps! Sorry never heard of it. I mean I've seen it but I never knew what it was called. Is it easy to install the hose over the barbed fittings? I guess this is how it's done?

Quote:

Originally Posted by Jim_PA

And I bought an Earl's -6AN bulkhead fitting to attach to the stock sending unit for a return.

Umm I don't think I follow... do you have a picture or link?

Jim_PA · 07-10-2010, 03:36 PM

Quote:

Originally Posted by structures

Hey thanks this stuff looks nice. No bulky hose clamps! Sorry never heard of it. I mean I've seen it but I never knew what it was called. Is it easy to install the hose over the barbed fittings? I guess this is how it's done?

Umm I don't think I follow... do you have a picture or link?

Yeah, you just push the fitting onto the hose. It's NOT easy

But it isn't coming off either. The stuff is tough as nails, and nice to work with once the hose ends are on. You have to make sure you get the right stuff. Some of it is not as good for heat as others, I'm looking up some info on it now.

My factory tank does not have a return line, so I bought an Earl's bulkhead 90 deg. fitting. I will take out the stock sending unit, and drill a hole through the top, next to the outlet pipe. Then I'll put the bulkhead fitting down in there, and tighten it up with 2 nuts, and attach a piece of hose along-side the factory output line down into the tank. Then I'll have a return line in my factory tank.

Jim_PA · 07-11-2010, 09:58 PM

After looking at my 4 yr old aeroquip socketless hose today, I can't recommend it anymore! It's not holding up. I'll be using 3/8 steel with AN adapter fittings.

68GMCCustom · 07-12-2010, 11:06 AM

good to know....

structures · 07-12-2010, 07:27 PM

So what's it doing? Cracking?

glock35ipsc · 07-13-2010, 12:42 PM

Quote:

Originally Posted by structures

I want to go with an in tank pump but if I can't figure this out I'll probably also go with the corvette filter/regulator.

***EDIT - I thought I would put the edit bold so everyone knew I was tarded! It never occurred to me that this was something other than a 73-87!

So if anyone saw this before I deleted it, know you know where my brain was!

I'm gonna go look at your build thread, then I'll be back.

*** Edit again - OK, I'm back. What kind of fuel tank will you be using? The original, or something different?

Jim_PA · 07-13-2010, 01:10 PM

Quote:

Originally Posted by structures

So what's it doing? Cracking?

Yep! I guess it works good if you want to replace it every 5 years

structures · 07-13-2010, 05:23 PM

Quote:

Originally Posted by glock35ipsc

What kind of fuel tank will you be using? The original, or something different?

Well I'm thinking about going with the early classic 23 gallon #911-SFFI. It's so expensive though.

cableguy0 · 07-13-2010, 05:28 PM

I would get in touch with fuelcellguy and have him build you a tank I'm sure he can destroy that price from early classic. heres a link to his website. http://www.aluminumfuelcell.com/index.html

**Clyde65** · 07-13-2010, 05:53 PM

try david boyd welding, also you dont really HAVE to buy the fuel injected tank, you can just get one to fit your truck for almost half of the FI tank cost. put the pump on the outside along the frame rail.

www.boydwelding.com

Tell him your on the board.

structures · 07-13-2010, 07:02 PM

Quote:

Originally Posted by Clyde65

put the pump on the outside along the frame rail.

What pump did you use?

So anybody seen a fuel tank where you don't have to move frame members around, can keep the spare tire location, and have a receiver hitch? Wishful thinking?

Guess I could try to do side saddle tanks.

glock35ipsc · 07-13-2010, 07:03 PM

I was going to suggest fuelcellguy too.

You could also use a 25 gallon tank from an 87 TBI Suburban, and use an OEM in-tank pump sending unit. That tank and sending unit setup can be found fairly cheap on the board's classified section, or a junkyard.

Even new, those tanks are under $100, a new sending unit is less than $70, pump is about $68, and the filter/regulator is $35. Complete setup for under $300, brand new.

Jim_PA · 07-13-2010, 07:21 PM

Quote:

Originally Posted by structures

What pump did you use?

Can't speak for him, but I'm using a Walbro 255 inline pump.

**Clyde65** · 07-14-2010, 10:08 AM

I used a Pierburg pump form Turnkey engine supply

http://www.turnkeyenginesupply.com/e...at=1&key=parts

07-09-2010, 10:36 PM	#1
structures Registered User Join Date: Nov 2009 Location: OK Posts: 274	LS Engine fuel feed system I have a 2006 4.8 ls engine and it only has one line at the fuel rails, the feed line. There is no return line nor is there a regulator. See below. So I understand the factory fuel pump has the regulator, filter and pump all in one unit. Below is an airtex E3609M. Which is like an OEM replacement. So if the OEM pump has the regulator, filter and pump all together, why are there return lines in the top? __________________ Robert 1965 Chevy C10 http://67-72chevytrucks.com/vboard/s...d.php?t=374373 1997 Chevy K2500 6.5 diesel

07-09-2010, 11:04 PM	#2
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: LS Engine fuel feed system I'd have to go crawl under a truck to tell you for sure, but I'm pretty sure those extra outlets just connect to the charcoal canister in front of the tank. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

07-09-2010, 11:19 PM	#3
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: LS Engine fuel feed system GM swapped from a return type, to a returnless fuel system in '04 I think. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

07-11-2010, 09:58 PM	#8
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: LS Engine fuel feed system After looking at my 4 yr old aeroquip socketless hose today, I can't recommend it anymore! It's not holding up. I'll be using 3/8 steel with AN adapter fittings. Last edited by Jim_PA; 07-11-2010 at 09:59 PM.

07-12-2010, 07:27 PM	#10
structures Registered User Join Date: Nov 2009 Location: OK Posts: 274	Re: LS Engine fuel feed system So what's it doing? Cracking? __________________ Robert 1965 Chevy C10 http://67-72chevytrucks.com/vboard/s...d.php?t=374373 1997 Chevy K2500 6.5 diesel

07-12-2010, 11:06 AM	#9
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: LS Engine fuel feed system good to know.... __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

07-13-2010, 05:28 PM	#14
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: LS Engine fuel feed system I would get in touch with fuelcellguy and have him build you a tank I'm sure he can destroy that price from early classic. heres a link to his website. http://www.aluminumfuelcell.com/index.html __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

07-13-2010, 05:53 PM	#15
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: LS Engine fuel feed system try david boyd welding, also you dont really HAVE to buy the fuel injected tank, you can just get one to fit your truck for almost half of the FI tank cost. put the pump on the outside along the frame rail. www.boydwelding.com Tell him your on the board. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

07-13-2010, 07:03 PM	#17
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: LS Engine fuel feed system I was going to suggest fuelcellguy too. You could also use a 25 gallon tank from an 87 TBI Suburban, and use an OEM in-tank pump sending unit. That tank and sending unit setup can be found fairly cheap on the board's classified section, or a junkyard. Even new, those tanks are under $100, a new sending unit is less than $70, pump is about $68, and the filter/regulator is $35. Complete setup for under $300, brand new. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 07-14-2010 at 10:19 AM.

07-14-2010, 10:08 AM	#19
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: LS Engine fuel feed system I used a Pierburg pump form Turnkey engine supply http://www.turnkeyenginesupply.com/e...at=1&key=parts __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

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