Enter your username:
Do you want to login or register?
  • Forgot your password?

    Login / Register



    Results 1 to 13 of 13
    1. #1
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States

      Fuel sending unit/line size help

      So it looks like stock LS fuel line sizes are 3/8" feed and 5/16" return according to Google.

      I was hoping to just buy a sending unit with two ports and just basically drop it in and be good to go. Problem is, I can only find sending units with a 1/4" return line.



      Is that too small? Am I just going to have to add my own port for a return line?
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap


    2. #2
      Join Date
      Apr 2012
      Location
      Woodstock, IL
      Posts
      2,410
      Country Flag: United States
      What exactly are you finding? Does it say 1/4” NPT?
      It’s not clear what sending unit you’re looking at, what tank you have, and even what car you have unless it’s a Nova like your username lol.

      -Dale
      SchwartzPerformance
      The leader in bolt-in muscle car chassis
      SchwartzPerformance.com | GMachineChassis.com | Facebook | Twitter | Instagram

      Dealer for: Forgeline, RideTech, Tremec, American Powertrain, Silver Sport Transmissions, GM Performance Parts, RECARO, Cerullo Seats, TMI Products, Vintage Air, Baer Brakes, Wilwood, BeCool, AFCO, Tanks Inc, Holley / Hooker, Ultimate Headers, Rick's Tanks, Moser Engineering, Currie, TechAFX, Stainless Works, II Much Fabrication, and many more

    3. #3
      Join Date
      Jun 2001
      Location
      Newbury Park, CA
      Posts
      5,821
      Country Flag: United States
      Depending on what you're looking to do, the Gen5 Camaro SS (2010) typically can be made to fit, can be converted to 60psi constant, and only requires a single 3/8" line to the rail. No filters, external regulators, return lines, etc. are needed. A Gen5 SS module new is about $112 from Rockauto, or about 1/2 that used on many of the Camaro forums.

      https://www.vaporworx.com/documentation/fuel-modules/
      https://www.vaporworx.com/documentat...nical-systems/
      VaporWorx. We Give You Gas http://www.vaporworx.com

    4. #4
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Sorry, lol.

      69 Nova.

      I searched for sending units with return lines and can only find them with 3/8" feed and 1/4" return.

      I originally wanted to just use the C5 regulator so I wouldn't have to run a return line, but I figured it would be easier to just plumb a return line since the engine is already set up for it.

      Thanks Carl, I'll look into the Camaro stuff.
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap

    5. #5
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,971
      Country Flag: United States
      When you say "sending unit" what do you actually mean? Some more details would be helpful.

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
      Instagram @projectgattago
      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    6. #6
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      The fuel sending unit.

      I figured that would be the easiest way to plumb a return line, just get a sending unit with a built-in return line.

      Aside from welding a sump onto the bottom of the tank or welding on a port for a return line, how else are you guys doing it?

      I do like the idea of using a 5th gen Camaro module, but I'm not the best welder so I don't know how I'd go about modifying the tank to fit it.

      Oh and if it makes a difference, the engine is an 07 L92.
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap

    7. #7
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,971
      Country Flag: United States
      Why not just get a Tanks Inc. tank?
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
      Instagram @projectgattago
      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    8. #8
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      I already bought a Camaro tank to move the fillet neck up from behind the license plate to up between the taillights. I'd rather not have to buy another tank, lol.
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap

    9. #9
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,971
      Country Flag: United States
      Quote Originally Posted by DarkoNova View Post
      I already bought a Camaro tank to move the fillet neck up from behind the license plate to up between the taillights. I'd rather not have to buy another tank, lol.
      Then I would highly recommend going with the vaporworks setup using the Gen5 Camaro SS pump and the modification to run it at a constant 58psi. This also eliminates the need for the Corvette filter/regulator and will eliminate any fuel starvation issues.

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
      Instagram @projectgattago
      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    10. #10
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Actually I just went in the garage and checked out the Camaro tank. I think it IS a Tanks Inc unit. I remember buying it either here or on lateral-g. It's already got the drop section where the sending unit goes and it has another hole next to the sending unit hole.

      I'm a bit confused about the 5th gen unit, though. Why do I need to modify it at all? Do 5th gens control the pump with pwm?

      I have a Holley Terminator kit ordered, I'll have to see how that controls the fuel pump.

      And then what about the fuel rails? Do I need new fuel rails since the engine has a return style setup?
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap

    11. #11
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,971
      Country Flag: United States
      The TerminatorX just turns the fuel pump on. Carl can answer in more detail about his modification to the Camaro fuel module.

      When you do the wiring for the Holley, I also highly recommend adding a power distribution module under the hood. This will feed the high demand circuits under the hood. I also do Holley EFI tuning.

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
      Instagram @projectgattago
      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    12. #12
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Oh, that's good to know!

      I just looked at the engine and it's a return less system, so either way I need to modify something.

      I'll wait for Carl to chime in, then.
      Matt

      69 Nova - 357, TKO600, Tru Turn, some other stuff, awaiting LS1 swap
      71 Duster - all stock, slant 6, automatic. awaiting HEMI/T56 swap

    13. #13
      Join Date
      Jun 2001
      Location
      Newbury Park, CA
      Posts
      5,821
      Country Flag: United States
      All Gen5/6, 2009+ CTS-V, GM trucks, etc. all use pwm to control the fuel pump/system pressure.

      The regulator that is in the module is used only as a safety valve and cracks at 88psi. This is so that there are not two pressure regulation systems working at near the same pressure.

      The C5 fuel filter/regulator is a return type and has a return. Every mechanical pressure regulation system has a return of some type.

      Lots of info here: https://www.vaporworx.com/documentation/
      VaporWorx. We Give You Gas http://www.vaporworx.com





    Advertise on Pro-Touring.com