Data: Stock Style Fuel System Limitations

Discussion in 'Fox 5.0 Mustang Tech' started by Rick 91GT, Sep 20, 2013.


  1. Rick 91GT

    Rick 91GT SN Certified Technician Site Sponsor

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    I see this topic brought up a lot and thought I would share some recent real world data straight off the dyno.

    331, AFR 185, spyder intake, v2sq 2.85" pulley, 6.87" lower.

    Stock fuel lines
    -8 feed from stock hardline to Edelbrock fuel rails
    -6 return to stock hard line
    Gs340 high pressure 255lph with vortech t Rex inline
    60lb inj

    5000rpm car went violently lean...550rwhp

    Replaced trex with gsl392 255lph inline
    6300rpm car goes to 13.5:1 and steadily goes leaner ....604rwhp



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  2. Grabbin' Asphalt

    Grabbin' Asphalt Mustang Master

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    So what is your recomendation for a complete stock fuel set up with a 255lph fuel pump only, .... good to what range of hp???
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  3. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    so looks like the gss340 can about handle you til the stock block limits
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  4. Rick 91GT

    Rick 91GT SN Certified Technician Site Sponsor

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    Na or boosted?

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  5. Grabbin' Asphalt

    Grabbin' Asphalt Mustang Master

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    Both :flag: stock set up 255lph with bigger injectors only.
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  6. Rick 91GT

    Rick 91GT SN Certified Technician Site Sponsor

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    450-480rwhp

    Around 500rwhp I like to see at least rails which will help keep more volume at the large inj.

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  7. MikeH686

    MikeH686 Mine is only two inches though.

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    At what point would you say it be good to upgrade the lines as well the same time you do the rails??
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  8. Rick 91GT

    Rick 91GT SN Certified Technician Site Sponsor

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    I like to do the pump and lines at once....

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  9. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    I have to wonder if that T-Rex is slowing fuel volume down a bit.

    Aren't those things designed to help the in-tank pump keep flow up at elevated pressures (say, an FMU)?

    At regular pressures, I have to wonder if the in-line pump might hinder the ability to flow all the volume demanded by that combo and 60 lb injectors.
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