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? http://farm5.static.flickr.com/4118/...ac7a06ec21.jpg http://farm5.static.flickr.com/4119/...79b00e4211.jpg http://farm5.static.flickr.com/4114/...c36b84a81c.jpg http://farm5.static.flickr.com/4100/...3defdbb63e.jpg |
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.
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Re: LS Engine fuel feed system
GM swapped from a return type, to a returnless fuel system in '04 I think.
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Re: LS Engine fuel feed system
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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. |
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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. |
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.
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Re: LS Engine fuel feed system
good to know....
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Re: LS Engine fuel feed system
So what's it doing? Cracking?
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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? |
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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
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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. |
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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. |
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. |
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Re: LS Engine fuel feed system
I used a Pierburg pump form Turnkey engine supply
http://www.turnkeyenginesupply.com/e...at=1&key=parts |
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