Anyone using the Holley EFI

Discussion in 'Pro-Touring' started by 2.5, May 17, 2018.

  1. 2.5

    2.5 Active Member

    Looking for someone that has done the Holley EFI swap. What fuel tank, regulator, pump, etc, did you use?
    Any experience in this conversion is appreciated!!
  2. BillA

    BillA Well-Known Member

    I swapped in a Holley Terminator EFI a few years ago and I'm very happy with it. It's pricier than some of the newer systems like FiTech or Holley Sniper but I think it's worth it. The ECU is fully tunable with a PC and the free Holley EFI software and if you venture in to multi-port EFI in the future all you'll need is a new harness. I used a stock tank that I drilled for an Aeromotive Stealth 340 in-tank pump (you can buy a fully loaded tank from Aeromotive, Rick's, Holley, Tank's Inc if you prefer). I also went with an Aeromotive regulator rated for EFI pressures. The Terminator is a return style system so you'll have to add a return line if you don't already have one. The Terminator prefers a single plane intake although I used an Edelbrock B4B and it ran fine. Just make sure you grind down the plenum divider or use an open spread bore to square bore adapter.
  3. 2.5

    2.5 Active Member

    Bill, thank you for the reply. I am currently trying to finish this swap but have ran into an issue. We went with the Tanks Inc tank with an in-tank Holly pump. The issue is when I go WOT the car looses fuel pressure and I was hoping someone else had experience with this. Based on what I am reading and talking to other people we have done everything that should have been done. There is something that I am missing, just have not found it yet.
  4. BillA

    BillA Well-Known Member

    I had the same issue on the chassis dyno causing me to cut that short until I diagnosed the problem. I determined the in-tank fuel pump I was using, a 200 lph Walbro, was too small. I swapped in a 340 lph Aeromotive and the problem went away. Do you have your fuel pressure regulator referencing vacuum? If you do make sure you are showing "0" vacuum at WOT on a vacuum gauge. If you still have vacuum at WOT and your pressure regulator is vacuum referenced you won't be getting full fuel pressure at WOT. Also, do you have the regulator on the return side?
    Last edited: Jun 11, 2018
  5. Robs455

    Robs455 Well-Known Member

    - Checkout voltage on the pump you should have at least 13V more is better
    - How is the pump mounted at the pickup? straight hose or a loop?
    - How much space is beteween the tank sock and the bottom?
    blyons79 likes this.

    NOTNSS Gold Level Contributor

    Starting my Sniper install soon. Subscribing to this thread..
  7. beaty0527

    beaty0527 Kenneth

    Installing Holley dominator, tanks inc tank with 255 Walbro pump. Still working on it so no feedback yet.
  8. Steve73GS

    Steve73GS Well-Known Member

    Anyone swap out a tank on a 73GS for EFI application? Investigating different manufacturers for fitment and it seems 73 is not listed, at least with their standard tanks. Any help would be appreciated.

  9. Mopar

    Mopar Well-Known Member

    I also have been looking, but so far it seems the 73 -77's have been left out in the cold.
  10. Steve73GS

    Steve73GS Well-Known Member

    Hmmm, ok. Will keep investigating and let you know any update Graham.

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