Fuel Pressure Question

Discussion in '1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-' started by sspnotcback, Sep 18, 2013.

  1. sspnotcback

    sspnotcback Member

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    ok guys i have a question about fuel pressure on my foxbody mustang.i installed an adjustable fuel pressure regulator and guage.at idle its right at 40psi,but i when u hit the throttle and rev it out it drops to about 30-32psi. so is it suppose to drop like that. my combo is a 351w with edelbrock rpm heads and trickflow intake.im still using the stock pump.
     
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  2. 84Ttop

    84Ttop They make new pistons every day, so why worry?
    SN Certified Technician Mod Dude

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    Make sure you set the pressure with the vacuum line disconnected and plugged.

    The pressure will vary based on the engine vacuum when everything is hooked back up and working correctly
     
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  3. Grabbin' Asphalt

    Grabbin' Asphalt Mustang Master

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    From ones I've seen, under load driving it goes up.and stays up, when in "nuetral rev" it goes up some and drops again.
     
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  4. sspnotcback

    sspnotcback Member

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    ok because i figured it should go up when reved.but like i said it drops to about 32psi. i have 30lb injectors is it most likely the stock fuel pump cant supply enough pressure. just seems like when driving it and when u put the engine under load it kinda sluggish.
     
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  5. Grabbin' Asphalt

    Grabbin' Asphalt Mustang Master

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    yeah mine goes up then drops to a lower setting sitting still in neutral also, but when driving it under load it goes up and stays there until i let off the gas.
     
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