Budget LS Square Body Fuel System

In this video, I show you guys my preferred way to put together a reliable and affordable fuel system for ‘73-‘87 LS Converted GM trucks. The majority of these parts are readily available at local parts stores, and I just really enjoy the way they come together. This setup is good for around 400HP. If your setup requires more fuel, I would recommend a genuine Walbro 255 or Aeromotive 340 pump, etc… Hope y’all enjoy! Feel free to comment or ask any questions you’d like. Thanks for stopping by!
-Alex

[@drewduckett81]

An install video on this setup would be awesome, thanks for making our lives easy showing all the part numbers!! Definitely gonna go with this for my 5.3 swapped 81

[@walkerperformance7626]

Thank you for tuning in. I’ll have plenty of videos coming with my ‘83 Sierra build.

[@endo71]

“Saved to Favorites”. This is perfect, and perfect timing. Thanks!

[@walkerperformance7626]

Glad you enjoyed it! Thanks for checking it out.

[@edcka29]

Very simple and informative.... thanks for part numbers and all.... made my job easy....

[@hardball107]

Good video, I do basically the same thing except I use 3/8" brake hard line with short hose pieces at connections. It works well with an external pump also with a 100 micron pre filter, in that case I return to the filler neck so you don't have to pull the tank. I also place the Corvette filter/regulator as far forward as possible so a cool supply of fuel dead heads into the fuel rail. I use Walbro 255 pumps for everything and on vehicles that might suffer from heat soak or vapor lock sometimes I install a T into the fuel rail and tap the outlet and install a Allen plug with a .5mm hole (.017") in it to return a small amount of fuel keeping everything cool. Works like a dream.

[@yamahondazuki95]

Love it man this is something different than I have seen done. You would need 3/8 for feed and 5/16 fitting for return line wherever needed but I like this idea for sure.

[@thesquarebodyc1098]

"What are you all doing for your Ls swap fuel system?" Famous phrase Walker tuned knows what I'm talking about. Thanks for making this video.

[@walkerperformance7626]

I was hoping it would be a good reference. Thanks for tuning in!

[@JeffGoDawgs]

Good to see you Alex you need to do more videos 👍🏻

[@walkerperformance7626]

Thank you! I’m hoping to get some more content rolling in. Thanks for watching!

[@3rdGenC10s]

Awesome video! Same setup I used on my 2wd k5 build. Part numbers are different but same general parts!

[@walkerperformance7626]

I appreciate it!

[@duanesgarage6294]

Thanks that will work on my square and my Malibu except the sender. 🇨🇦🏁

[@Ozsanti71]

Thank you man. Very helpful 👍

[@terrybigchopzguest]

Nice video kept them coming, wish I was need you so I could get a tune

[@walkerperformance7626]

Thank you, Terry! I also offer mail order bench tuning for long distance customers. For more details, feel free to reach out via email. [e-mail]

[@swatson0061]

Cool. Thanks for the info.

[@patrickmacord8725]

Great video! Can you do a video of the installation of all the parts? I bet your subscribers will ten fold. Part 2 of the fuel system.

[@walkerperformance7626]

Thank you! Hopefully I can make another over the installation on my ‘83. Thanks for the suggestion!

[@josephburnham4621]

Great job buddy 👍🇺🇸

[@walkerperformance7626]

Thank you!

[@gmctx5487]

👍 love to see more that OBS

[@walkerperformance7626]

Hoping to upload a walk around with details soon. Thanks for watching!

[@dylanbrooks7313]

Walker performance is there any way you could post all the part numbers for the fittings and stuff I tried to stop the video to right them down thanks

[@khenderson3693]

Great video, thanks. Can you make any suggestions for the square body dual tank switch?

[@walkerperformance7626]

Thank you! The best way to do the dual tank switch setup is to update your wire to at least 12ga and replace your switching valve to the newer version from Pollack. It is updated and will withstand more pressure.

[@khenderson3693]

@@walkerperformance7626 I will do that, thank you

[@peterhatch1583]

Thank you for this i was looking at $1600.00

[@walkerperformance7626]

Yes sir! Glad you like it. You can save about $600-$700 doing it this way. Thanks for watching!

[@thomasjohnson8195]

I have two questions I’m doing the same setup other than the pump 1. On the sending unit I have a purple and gray wire which one goes to the gauge and the power wire. 2. What do you use for the vent on the sending unit and a part number. Thks

[@walkerperformance7626]

The gray is the power wire for the pump and the purple is for the sending unit. I use the factory tank vent hard line and either run a small pcv filter on the end or a roll over valve.

[@chingonchacho]

do you have a parts list to order everything

[@davidjessee7701]

I just Ls swapped an 84 k10.. I believe they installed a walboro pump on the rail, and it is very noisy. I installed a new tank with new pick up and sending unit a couple years previous…. My question is would a pump inside the tank be a lot quieter?

[@walkerperformance7626]

Hey David. Yes, it would be much quieter, more efficient and you would see more longevity out of your fuel pump. Every conversion I do receives an in-tank pump. Externals are just a nightmare.

[@efrainromo3607]

Is this sending unit for drivers side or passenger side tank? Or will it work on both? I have passenger side, great video Thanks!

[@walkerperformance7626]

Hello, Efrain. Sorry for the delay in my response. I used the driver’s side tank and sender in this video. The sending units are reversible, so you can change up your fuel line routing if desired. Hope this helps!

[@walkerperformance7626]

Hello, Efrain. Sorry for the delay in my response. I used the driver’s side tank and sender in this video. The sending units are reversible, so you can change up your fuel line routing if desired. Hope this helps!

[@Fahrenheit_Motorsports]

Wish I would have seen this video a month ago. I purchased the Holly EFI fuel pump module. It’s going everything needed for the LS including an in tank return. Not sure what I do with the truck intake manifold and it’s return line. Suggestions? Can it be blocked off or do I need to change to a system that doesn’t have a fuel return like the SS trailblazer setup?

[@walkerperformance7626]

You can find return-less fuel rails that came on some ‘03-‘07 Tahoes, Silverados, etc.

[@Fahrenheit_Motorsports]

@@walkerperformance7626 I got lucky a few weeks back and find the only stainless, returnless style fuel rail for the truck intake. It’s since been installed and waiting for the truck to get wired up. Thanks for the response man!

[@renetavares586]

Can you help me more about fuel system sir

[@MiguelRamos-ry8io]

Which fitting do you use for the top of the regulator going to the fuel rail? And can we run the rubber hose for the whole system from regulator to fuel rail?

[@walkerperformance7626]

It’s an EFI to -6 AN fitting. Yes, you can use the EZ Street hose for the entire system. Just watch for sharp edges and keep it away from heat.

[@MiguelRamos-ry8io]

@@walkerperformance7626 sounds good man thank you, I appreciate your reply 👍🏻✌🏻

[@gdp2727]

Will all those parts work for a k5 blazer tank conversion in a 1986 k10?

[@walkerperformance7626]

Yes, they sure will. The only difference will be your tank and sending unit. The part numbers are different, but same process.

[@Blakep7704]

What would need to be changed if the truck is an 87 with the original tbi? Would changing only the pump work with the factory fuel line? 87 has a return line from the factory.

[@walkerperformance7626]

All you’ll need to do is upgrade your fuel pump and install EFI rated fuel hose with EFI clamps. Nothing wrong with re-using the hard line on an ‘87.

[@Blakep7704]

@@walkerperformance7626 what pump works?

[@walkerperformance7626]

@@Blakep7704 AC Delco EP381, Spectra Performance SP1115, Genuine Walbro 255.

[@davidessien5465]

Please, if the return fuel system is not allowing fuel to go flow back to the track, what could be responsible for that? It's a friend picnic with a 5sfe engine with 4cycl

[@walkerperformance7626]

@@davidessien5465 you could have your supply and return lines mixed up, or an obstruction somewhere.

[@davidessien5465]

Thank you sir❤​@@walkerperformance7626

[@Idkk587]

Would this work for my 1986 Sierra? I’m putting a stock 99 5.3 in it

[@walkerperformance7626]

Absolutely.

[@mechtech85]

Wish I would have seen this a few weeks ago before I butchered an 85 sending unit l!!!! Edit. Not a baffled tank

[@stevoeight]

Is there a single pump that would work in that hanger for a cammed ls3?

[@walkerperformance7626]

There is. I would recommend a genuine Walbro/TI Automotive 255 LPH. It should come with the internal harness and would be plug and play.

[@miguelmartinez418]

What would I use or part number for dual tanks and got 6.0 ls with cam would I use walboros fuel pumps with same unit your showing or different

[@walkerperformance7626]

Fuel tanks are the same part number. The passenger side sender is an FOG5N. A genuine Walbro/Ti Automotive fuel pump will drop right in.

[@miguelmartinez418]

@@walkerperformance7626 so one side would be the fgo5m and the other the one you just said and both will plug into a walboro fuel pump

[@walkerperformance7626]

@@miguelmartinez418 correct.

[@miguelmartinez418]

@@walkerperformance7626 alright thank you very much

[@iceman1739]

Why would you need the tank sending United and another one on side?

[@walkerperformance7626]

I’m sorry, but I’m not sure what you’re asking. There is only one sending unit required in the setup, and it’s in the tank. 1987 R10 pickup.

[@mikedimas373]

What local part store's did you get the fragola fittings?

[@walkerperformance7626]

Race Parts Solutions (Dealer for Fragola) is about half an hour away from me.

[@gdp2727]

Having a hard time finding the AC Delco EP381 got any tips?

[@walkerperformance7626]

You can also use the Spectra Premium SP1115.

[@gdp2727]

Thanks Alex

[@captainsledge7554]

Hm.. mine already had sending units

[@danjim7056]

Is this like 1987 tank? I need a tank but for a long box and they are a bit longer making them 20 gallon.

[@walkerperformance7626]

Yes, you need a GM1C.

[@danjim7056]

@walkerperformance7626 thank you sir.

[@jjch34]

Hey bud how do I get ahold of you I’m going to need to have a tune done soon and have a few questions

[@walkerperformance7626]

You can email me at [e-mail]

[@jessefarley4609]

I know O'Reilly's has rubber gates efi/e85 in bulk buy by the foot or w ,25foot hose I think part numer is like 17092 don't quote me on this and then they have buck barbs to screw into steel and efi hose clamp buy the box or each price isn't bad normally kept for commercial customers but they don't care to sell to a walk in I spent 7years as a manger and I would bet my truck title I could of gotten all those parts cheaper and if you buy much for like a restore then go in and ask to apply for a cash account it saves a ton on the little stuff or there the bendable steel stuff most people use for brakes but since the fittings are brass kinda illegal but seen a ton of them used but work great for fuel and transmission just ask if you can look at their fittings also there's some rolls of copperhead line it's actually can be used for brakes and it's fairly cheap and no bender needed just my two cents...when I get to that point on my square body I'm gonna run all metal lines like factory then depending if I carb 5.3 I'll thread it into the carb and if I efi I'll run metal to fire wall with a compression barb to efi hose

[@egonzalez3766]

what do you do for dual tanks?

[@walkerperformance7626]

Haven’t made one function yet. On the one I have done, I used the passenger tank as a reserve to pump into the left tank. May have a video on that soon.

[@jas9020]

Do you have to tune it after ,🤔

[@walkerperformance7626]

I’d definitely recommend tuning or at least looking at data after fuel system changes.

[@stevepope5484]

Guess u didn't have time for details? Why can't folks do videos like this??? He hasn't filmed his yard/cat /tractor/mentioned his dentist? Just The Facts. Excellent Video!

[@darylwood9361]

Can you give me the part # for the fuel line?

[@walkerperformance7626]

Fragola 732006

[@darylwood9361]

@@walkerperformance7626 what fittings do I need to use on this hose to work with the fittings on the sending unit?

[@walkerperformance7626]

@@darylwood9361 you’ll need 3/8” and 5/16” hard tube to -6 fittings. They’re available at summit or Fragola.

[@tyferguson564]

You think this will work for a 70 c10

[@TheLimitedmod22]

If you move the gas tank under the bed it would....pretty certain sending unit will not fit tanks in cab. I put '68 Nova gas tank at rear frame rails to get them out of the cab. You just need to cut the neck down and use 2" (I believe) gas filler hose to reconnect the tube

[@walkerperformance7626]

It would be a lot of work to get this setup to work on a 67-72. You’d be better served using a blazer style tank or one from Boyd Welding.

[@tyferguson564]

@@walkerperformance7626 do you know what year blazer tank to use?

[@walkerperformance7626]

Just found an EFI ready rear mount fuel tank for 67-72 trucks. Check out Tanks Inc.

[@ramiroramiro7010]

My fuel pump sending 110 psi wat needs to do 84 c 10 put 09 5.3 but not having return line fuel need regulator o is fine thanks 🙏