Help with fuel system design for LS1 install

[glock35ipsc]

Originally Posted by High ho silverado

I'm curious about the sender attachment that was asked earlier, on the older senders how are the hoses being attached, I was thinking of flaring the lines and using an fittings to braided hose, haven't seen any picks of this and was jus curious, ill b using a factory sending unit for an 87 tank with my pump, jus curious how others are doing this, glock didn't cover that in his section, jus that he used 87 tanks, also curious what pumps he used in that set up too. Thanks for any help.
Posted via Mobile Device

As far as attaching the fuel line and the return lines to the sending unit, I just used regular fuel injection rated hose clamps. I used them in the fuel filter/regulator too.

I used an 87 sending unit, which is already fuel injected, so the in-tank pump I used was just a simple R&R. The pump part # is listed in my thread..... somewhere. Lol. It's an OEM AC Delco pump. And those OEM pumps have been working fine with zero issues.

Now, if you are using 86 and earlier sending units, you will be better off using an external pump.
Posted via Mobile Device

[High ho silverado]

It's an 87 sender, I swapped the truck to tbi when I first put it together and put a brand new 87 tank and sender in it. I didn't think the stock 87 fuel pump would put out the 60 psi I would need for the 6.0, I was gona see if walbro made a direct fit that put out enuff pressure, I had figured that's what u were using, also not to sidetrack the thread but I realy need to find longtubes that will work on a four wheel drive other than dt's. Thanks for the help by the way and I followed ur Fred build very closely, it is really close to what I'm planning only in a four wheel drive. Great tips keep up the great work.
Posted via Mobile Device

[glock35ipsc]

The 87 pump won't, but the oem pump I used does. I don't remember the part number right off, EP-241 or something like that. $60 or so. Look back through my thread, there is a full list of parts and numbers and where I bought everything from.
Posted via Mobile Device

[High ho silverado]

Thanks bob, another useful tip, ur the man. When I get every part figured out I'm gona start a thread, I'm even gona do my own wiring harness, possibly do my own ecm if I can figure out which program to run, I'm trying to get the hptuners thing going but I haven't had enuff time to get it done yet. Don't know how many people would be interested in it but we will c. Again thanks for all the info!
Posted via Mobile Device

[yossarian19]

What are people doing as far as vent / rollover valves?
I'm retro-ing a Camaro LS1 pump into a 1970 Mustang tank, not sure what I need to do to keep air moving appropriately in / out of the tank.

[68GMCCustom]

for an older tank a vented cap?

those that have new custom tanks generally have a vent/roll over valve installed from the tank builder....least mine did.

[Roostboy102]

What filter are you people running with the return style system? Am I thinking right to use a 97 Vette filter?

[BR3W CITY]

Earls in-line -8AN fuel filter. Just make sure whatever you get is rated for fuel injection levels of pressure.

[Roostboy102]

Originally Posted by BR3W CITY

Earls in-line -8AN fuel filter. Just make sure whatever you get is rated for fuel injection levels of pressure.

I saw there's an earls with a max psi of 80 with barbed fittings which is what I'm looking for... Or that vette one...
Posted via Mobile Device

[TypeSL2]

I am moving my fuel tank from the cab to under the bed and plan to do a 6.0 Swap later on down the road. I have a lot of stuff to do the swap, but not all of it. My question is, do I need to do anything to the tank to prep it for the LQ swap, or can I run it like it comes. I need to know very soon because I am swapping the tanks out very soon and want to do it right the first time. I really don't want to have to take the tank out later if I don't have to.

James

[ChevyCruizer]

What tank do you have? Is the pump an internal or external? Is your tank set up for EFI (does it have baffles). After that it will come down to fuel supply and return lines designed for the higher pressure. The tank I got was just a carb version and it has not been hard, but just extra work to get it set up for a LSx motor. If I would do it again I would just get the tank designed for EFI with the proper pump in the tank.

Originally Posted by TypeSL2

I am moving my fuel tank from the cab to under the bed and plan to do a 6.0 Swap later on down the road. I have a lot of stuff to do the swap, but not all of it. My question is, do I need to do anything to the tank to prep it for the LQ swap, or can I run it like it comes. I need to know very soon because I am swapping the tanks out very soon and want to do it right the first time. I really don't want to have to take the tank out later if I don't have to.

James

[yossarian19]

Originally Posted by TypeSL2

I am moving my fuel tank from the cab to under the bed and plan to do a 6.0 Swap later on down the road. I have a lot of stuff to do the swap, but not all of it. My question is, do I need to do anything to the tank to prep it for the LQ swap, or can I run it like it comes. I need to know very soon because I am swapping the tanks out very soon and want to do it right the first time. I really don't want to have to take the tank out later if I don't have to.

James

There are a few factors involved here. I'll try and cover all the bases, but I haven't finished my coffee yet...
The 6.0 (or any LS) swap takes either a factory style pump that lives in-tank or a Walbro external that will give you 60 psi at the rails.
The Walbro external pump can suck fuel from the bottom of the tank, no mods needed. It is cheaper than a (new) factory style fuel sender, doesn't come with a level sender, is easier to replace and will not generally live as long as a fuel pump that is submerged in fuel. Heat is the main reason for that, vibration possibly another, quality also possible. OEM = King for reliability, most of the time.
The factory style basket pump will need a hole cut in the top of the tank & adapter ring welded to the tank to bolt it down. Vetteworks makes pump adapter kits that run around 75 bucks shipped and use the readily-available LS1 camaro fuel sender. Now for the catch: depending on tank depth, you may not be able to run the Camaro fuel module (pump + gauge sender) on less than 1/2 or 1/4 a tank of gas. It's about a 10" tall sender, so check that against your tank & see what's going to work.
Another consideration in your fuel setup is whether your motor will have a return line at the fuel rail or not. I think up until 2004 the truck motors all had a return line at the rail. After that, the returns were closer to the tank. Location of the return line is going to dictate your filter setup - camaro LS1 or 2004 Corvette "C5" filter. Either way, you'll need a return line on top of the tank.
A lot of guys, including me, use the '71 Mustang 22 gallon tank. Honestly, I wouldn't reccomend it. Any money I saved has long gone out the window in chopping on my frame to make it fit & fiddling with spacers & **** to mount it. I have long wished I'd gone with a custom for-the-truck-I'm-putting-it-in tank for $400, drilled 4 holes & been done with it. I'd have a filler on the rear fender, a more-stock frame & been done with that part of it.
Anyway, you've got options. One of them is to get a return line on top of the tank before you install it, put a line on the return that you can reach, tape it off & connect it when you get to the 6.0 swap, using a Walbro thats taking fuel off the bottom of the tank same as your carb. Just make sure you update fuel lines to handle the increased pressure.

[TypeSL2]

That is great info yossarian. That sounds very similar with what I had gathered so far. I need to measure the height of my TBSS pump module and see if I can get that to work. I don't remember off the top of my head if the fuel rail I have has the return or not. Something I can find out tonight. I am going to bookmark this page so I have all of that. Thanks for the quick answer. Hopefully that will help other people also along the way.

James

[68GMCCustom]

Mines had a carb pump and now efi pump...mounted on the frame...no issues so far.

[WickedDirtBag]

Posted via Mobile Device

[DA CHILL ONE]

I'm new to this forum, but I've been reading the different post for a couple weeks now trying to figure out what year, make, model truck or car gas tank will fit under the bed of my 67 gmc swb truck. I'm in the process of installing a 5.3 from a 03 chevy avalanche. this is my first time trying to do something like this, so all and any help you guys can give me would be GREATLY APPRECIATED!!!!!!!!!!!

[solidaxel]

Steel braided Teflon line with steel 37* fittings drilled and silver soldered to the fuel rail and tank sending unit for the 87 fuel sender, stock fuel filter with steel fittings silver soldered. the tank is a Dorman tank for a 87 short bed

[DA CHILL ONE]

thanks i was dead in da water, do u know if the digital dash that lmc offer will work with a 4l60e transmission or will i still have to buy the cable x to make da speedo work

[LowLifeS10]

Is this the return style fuel system?

[LS-K]

BUMP. I've got the same question LLS10

[CamaroChris]

No the black hose sucks fuel vapors from the tank for emissions

[LS-K]

Thanks CC. This eliminates one thing out of the fuel enigma.

[McMud]

Hey Guys,

i also ordered a 06 LQ4 to swap it into my 1797 Suburban.
The Seller told me that i have the Rail System with the Return Line, so no Vette Filter.
Should i use filter before or after the 255 Walbro?
Does anybody of you know what size and type of connections a 79 Fuel Tank has?
Does this Fuel Tank have a Connection for a return line?

Greets From Austria :-)

[littlevictories]

Originally Posted by McMud

1797 Suburban.

damn, that's an oldie! didn't know Napoleon was a GM guy!

[ls1nova71]

Originally Posted by McMud

Hey Guys,

i also ordered a 06 LQ4 to swap it into my 1797 Suburban.
The Seller told me that i have the Rail System with the Return Line, so no Vette Filter.
Should i use filter before or after the 255 Walbro?
Does anybody of you know what size and type of connections a 79 Fuel Tank has?
Does this Fuel Tank have a Connection for a return line?

Greets From Austria :-)

2006 seems awful late to still have a return style fuel rail. Your '79 tank will just have hose pushed on the sender and clamped. If you are planning to run an external fuel pump, it would be in your best interest to use some kind of a pre filter to keep any junk out of the pump. People have run them without a filter, but you are taking a chance, and if it's worth doing, in my opinion I would do it once and be done with it. That said, your even better option would be to get a '87 tank and sender and put a Walbro 255 pump in the tank. That is if an '87 tank will fit a 1797 Suburban. Pretty sure you meant 1979?