LS1 Fuel Pump in 79 Z/28 ?? Possible

Discussion in 'High Tech Retrofits' started by npersha, Mar 17, 2011.

  1. 76LS1bird

    76LS1bird Member

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    I did this in my 78 tank. Used a 99 Z28 fuel pump assy.(not cut down)
    I also cut hole in trunk floor to get to pump.
    [​IMG]
    [​IMG]
     
    Last edited: Apr 2, 2011
  2. anesthes

    anesthes Veteran Member Lifetime Gold Member

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    So a buddy of mine who manages an Autozone did some research for us.

    A 1995 or newer, 2-door blazer runs a 8.5" tall pump. The tanks are metal, so buying a used tank out of a junkyard just cut the top of the tank and weld it to the top of the camaro tank.

    The blazer pump (vortec MPFI blazer, not TBI) is the same as an LS1 pump, has two socks, the checkball, and has a build in reg if you choose to use it.

    I just need to figure out how to adapt the lines to 3/8". Right now I have AN braided hoses going to the rear, and they turn into 3/8" steel lines by the axle. If I could splice the S10-vortec sending unit to 3/8" lines I'm golden.

    -- Joe
     
    Last edited: Apr 3, 2011
  3. reedld

    reedld Veteran Member

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    Did you have to cut the trunk in order for the lines to fit?
    You have a real nice setup.. Have you run this system very long?
    Any issues? Thanks

     
  4. 76LS1bird

    76LS1bird Member

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    Its worked good for 5-6 years, & I din't cut the floor.
     
  5. reedld

    reedld Veteran Member

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    Thanks..it is what I am going to try very soon. I plan on putting the 4th gen pump exactly where you did, but retaining the OEM float (autometer cobalt series fuel gauge is 0-90 ohm not the 1999 style). Your LS swap is by far one of the nicest I have ever seen. thanks for the reply. hopefully I'll see your car in person if I ever travel to Carlise.

    Leon

     
    Last edited: Apr 3, 2011
  6. mrvedit

    mrvedit Veteran Member

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    This is one of the most informative posts on EFI fuel tanks ever. Now I understand how a "bucket" works and it sounds better and easier to build than complex baffles.
    My only suggestion is to not use the built-in regulator. People on ls1tech.com complain about that all the time and suggest regulating at the engine and using a separate return line. Otherwise while you might have 60 psi at idle, it is guaranteed to go down at fuel flow increases, making it harder to tune the engine and perhaps even requiring larger injectors.
     
  7. anesthes

    anesthes Veteran Member Lifetime Gold Member

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    Do you guys with an LS1 pump on hand know what the diameter is on the top of the pump? I want to know if the vetteworks ring kit will work on the Vortec blazer pump (which is under 9" tall so it doesn't need to be cut down to fit in the tank).

    -- Joe
     
  8. usmcz28

    usmcz28 Veteran Member Lifetime Gold Member

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    I have one out in the garage but i'm out of town until tomorrow night, I can let you know when I get back in home.
     
  9. anesthes

    anesthes Veteran Member Lifetime Gold Member

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    That would be great. If possible, I'd like to use the vortec sender because it's shorter but my buddy thinks the ring size is different between the vortec sender which is intended to use a metal tank, and an LS1 pump that typically uses a plastic tank.

    -- Joe
     
  10. firebird_ta79

    firebird_ta79 New Member

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    anesthes
    If you are using a stock 79 tank a ls1 pump will fit . Whatever pump that you chose to use will have to be long enough to sit tightly on the bottom of your tank.
     

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