320 Lph In Tank Fuel Pump And Stock Regulator? Excessive Flooding?

Discussion in '1996 - 2004 SN95 Mustang -General/Talk-' started by 98blackstallion, Sep 19, 2013.


  1. 98blackstallion

    98blackstallion Member

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    Hey guys I added a 320 LPH pump to my 97 cobra for my vortech setup and this car is flooding out horribly. My tuner and I datalogged fuel trims and they are within reason. However this car is blowing black smoke severely and barely running. I pulled the plugs and they are carboned up with fuel soak. Could this high volume pump be overrunning the stock FPR?
     
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  2. superstang01

    superstang01 Member

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    i doubt it.....but i could be wrong, its happened before

    im pretty sure people run the ford GT pump with the stock FPR and that pump is 310lph
     
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  3. 98blackstallion

    98blackstallion Member

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    Alright went out and did some more testing this time not rushed like earlier. After 3 key cycles the pressure shot up to and held about 37 psi. That's a least some decent news I think lol
     
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  4. Nightfire

    Nightfire Mustang Master

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    310lph pump here with stock FPDM and no problems
     
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  5. wmburns

    wmburns SN Certified Technician

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    Help me out here. This is a return fuel system correct? Why hasn't the fuel pressure been measured/logged then you would know?

    The post doesn't state how the 37 PSI measurement was done. Because 37 PSI at idle is too high if measured with an external gauge at idle. At idle there should be a vacuum inside the intake. The fuel pressure should be closer to 32 PSI.

    Has the intake vacuum reference line been confirmed connected and leak free?

    The other thing that's not correct is the fuel trim values. If the fuel trim values are correct but the spark plugs say rich, that says to me "EXHAUST" leak or the PCM closed loop processing is not working.
     
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