LS Engine fuel feed system

[structures]

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]

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]

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

[Jim_PA]

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]

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.

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.

[glock35ipsc]

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?

[structures]

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.

[structures]

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?

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]

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]

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]

good to know....

[structures]

So what's it doing? Cracking?

[Jim_PA]

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