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 Advanced Member

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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 Advanced Member

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    Both :flag: stock set up 255lph with bigger injectors only.
  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??
  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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