This post is not for the hardcore purists (err, or for any purist really )

Holley is going to be featuring myself and the Firebird in an ad campaign.
I'm currently on a 4150 HP 750cfm 4bbl double pumper.

Part of the arrangement will include a transition to Holley Avenger EFI 550-401.


My vehicle has the basic mechanical fuel pump and no return line. Vechicle suffers from lots of starvation issues (primarily from being at rest, hot or cold) - evaporation as well a the fuel backing down a bit too far... hot fuel line temps... etc. (Long turnover times as fuel takes a while to get to the carb after sitting for a while cold, or sitting for a short while hot)

I had been considering the 73 455 SD fuel pump & adding a return line.

I'm now going EFI. I am now open to the idea of an electric fuel pump.

I like the fact that it can force the fuel forward without cranking, as well as it being a bit easier to route the fuel line away from hot engine components.


If you have EFI, or were going EFI - would you be considering an electric fuel pump?
Would you plan to have a fuel pressure regulator?
Where would you mount the pump? (I've seen it in the trunk as well as hidden in body panels)
Would a return line be appropriate for this config w/electric fuel pump?

Thank you for not flaming me

two people in HALF did EFI....lots of problems....

one guy had to replace the tank eventually , one with internal baffles etc , as when on a climb ,would run out of gas...not the only problem....he had it done before our trip to Estes Park....really slowed our group down with his continually problems...one was the 'safety' line that supposedly wont let gas tank drain if you flip...it kept messing up...all i can say is after these two guys` experiences , and costs I would never do it...and the positives do not out weigh the costs alone.

and Im not sure it was Holley brand.

That Holley kit you reference has an electric in-line fuel pump included right in the kit. I'm reasonably sure that using their included pump is pretty much a requirement for the system to work, but I've never worked with installing an aftermarket EFI kit firsthand.

You will need to add a return line since your car doesn't have one.

If Holley is featuring your car in an ad campaign, I will assume they will provide you with some tech assistance to make certain it works properly? If I were you I'd be taking every advantage of Holley's resources to get your car to run right with their system.

Let us know how it goes! I'm always been intrigued by these types of systems, have never known anyone who installed one.

I converted my Jeep Wrangler to a TBI system from Turbo City. It included the required electrci fuel pump. EFI requires a much higher pressure, 20-40 psi than mechanical units which max out at 8 psi or so.
My install went easy and the driveability went so much higher from the leaky Cater 2 barrel. was it worth the $1,600 and 2 weeks of my time, maybe.

Thanks for the info, everyone!

Bjorn: Sounds like a nightmare!

Crazecars: Interesting thought. Yes, they should be giving some technical resources. They don't exactly value this at even the full price of the setup... but, if I am going to give a good testimonial for the product, then I definitely need to have the support to have the product set up perfectly!

I was under the impression that you needed to run an in-tank elect pump with an EFI setup. I suppose all kits are not the same.

thats what my friends had to do, plus baffled tank...

The one for my Jeep had an external, inline electric fuel pump and filters that I mounted to the frame rails near the tank. Then had to fab a "skidplate" to protect it from the rocks, mud etc that I drove my Jeep through.