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Fuel pressure? #2650011
04/28/19 09:09 PM
04/28/19 09:09 PM
Joined: Feb 2009
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Crofton, Ky.
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rattler Offline OP
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rattler  Offline OP
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Crofton, Ky.
What fuel pressure does a 5.7 Hemi need? I need to buy a pump for my 64 wagon to 5.7 Hemi conversion. I can't mount an in-tank pump, so I'll have to mount one on the frame as close to the tank as possible. But, I need to know the pressure requirement before I order one. Thanks.


1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)
Re: Fuel pressure? [Re: rattler] #2650025
04/28/19 09:45 PM
04/28/19 09:45 PM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
GoodysGotaCuda  Offline
5.7L Hemi, 6spd

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Posts: 25,050
Texas
I run ~58psi on my stock injectors.

Any chance you can clear an Aeromotive Phantom kit? We installed one on a plastic D100 tank, which has no aftermarket tank support and it works very well!

Most any ~200-340lph EFI pump will have no problem running the average V8. I'd do everything I could to avoid an external pump, however.

Last edited by GoodysGotaCuda; 04/28/19 09:45 PM.

1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: Fuel pressure? [Re: GoodysGotaCuda] #2650243
04/29/19 03:04 PM
04/29/19 03:04 PM
Joined: Nov 2006
Posts: 2,252
IL
furious70 Offline
top fuel
furious70  Offline
top fuel

Joined: Nov 2006
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In a decade of EFI use I've run an external Walbro 255 and it's been just fine. On an all day drive it does get a little loud but never left me stranded. 43psi.

*edit* 43psi is for my classic FAST controlled 383, not for a Gen III, should have made that clear.

Last edited by furious70; 05/01/19 02:24 PM.

70 Sport Fury
68 Charger
69 Coronet
72 RR
Re: Fuel pressure? [Re: furious70] #2650432
04/30/19 07:38 AM
04/30/19 07:38 AM
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Posts: 303
southwest Alabama
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challenger73400 Offline
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southwest Alabama
I had the same problem with my 58, not enough room for a efi pump to add to the top of the tank. I used a low pressure pump by the tank to feed a fitech command center 2 under the hood. The command center 2 runs 58 psi and continuously circulates fuel back to the tank. Oh, you have to add a return line.

20190113_153650-1328x747.jpg
Re: Fuel pressure? [Re: GoodysGotaCuda] #2650674
04/30/19 09:08 PM
04/30/19 09:08 PM
Joined: Feb 2009
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Crofton, Ky.
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rattler Offline OP
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The station wagon is stood on edge in the driver side quarter panel. So, no, there just isn't any room.


1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)
Re: Fuel pressure? [Re: challenger73400] #2651032
05/01/19 08:07 PM
05/01/19 08:07 PM
Joined: Feb 2009
Posts: 773
Crofton, Ky.
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rattler Offline OP
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I can't remember, is there a return line coming off the fuel rails? If not how did you route a return line?


1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)
Re: Fuel pressure? [Re: rattler] #2651073
05/01/19 10:15 PM
05/01/19 10:15 PM
Joined: Mar 2005
Posts: 303
southwest Alabama
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challenger73400 Offline
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I ran a stainless supply and a return line down the inter passenger frame rail. The fitech kit came with a fitting to install the return into the tank.

20190329_170141-1328x747-664x374.jpg
Re: Fuel pressure? [Re: rattler] #2651074
05/01/19 10:30 PM
05/01/19 10:30 PM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
GoodysGotaCuda  Offline
5.7L Hemi, 6spd

Joined: Nov 2004
Posts: 25,050
Texas
Originally Posted by rattler
I can't remember, is there a return line coming off the fuel rails? If not how did you route a return line?


Factory rails do not have a return fitting. It's not uncommon to run a regulator near the tank. That setup makes for some fluctuating fuel pressures, but it is at least consistent fluctuating that can be tuned to.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: Fuel pressure? [Re: GoodysGotaCuda] #2651202
05/02/19 12:33 PM
05/02/19 12:33 PM
Joined: Oct 2003
Posts: 1,794
BC Canada
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ogopogo Offline
top fuel
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Hmmm,I have a 70 challenger doing a 5.7 hemi install,with a spectra efi tank,i was just about to add a return line to the car for the efi but its not needed? car has 5/16 stock fuel line,(340 car)







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