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  1. #1
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    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
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    What exactly are you finding? Does it say 1/4Ē NPT?
    Itís not clear what sending unit youíre looking at, what tank you have, and even what car you have unless itís a Nova like your username lol.

    -Dale
    SchwartzPerformance
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  3. #3
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    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
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    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
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    When you say "sending unit" what do you actually mean? Some more details would be helpful.

    Andrew
    1970 GTO Version 2.0
    1967 Cougar build
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  6. #6
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    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
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    Why not just get a Tanks Inc. tank?
    1970 GTO Version 2.0
    1967 Cougar build
    GM High-Tech Performance feature
    My YouTube Channel Please Subscribe!
    Instagram @projectgattago

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

  8. #8
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    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
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    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 2.0
    1967 Cougar build
    GM High-Tech Performance feature
    My YouTube Channel Please Subscribe!
    Instagram @projectgattago

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

  10. #10
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    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
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    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 2.0
    1967 Cougar build
    GM High-Tech Performance feature
    My YouTube Channel Please Subscribe!
    Instagram @projectgattago

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

  12. #12
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    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
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    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