Low Fuel Pressure

Discussion in 'Mazdaspeed 6 Troubleshooting' started by Turbo, Feb 10, 2016.

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  1. Turbo

    Turbo Greenie Member

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    Morning all,
    To shorten this post I will sum up all that has been done recently.
    I smelt fuel, found blown out O-ring from bad dealer install when they replaced my injector year ago. Fixed this and added CorkSport Injector seals. Car ran better than ever for a week. Started stuttering under boost so I logged it (attached). Car is parked due to this massive fuel drop off. Fuel pump internals are Corksport, and I have pump off now with no visible failure present. Any ideas would be helpful. Mod list at bottom


    Custom 3" CBE with Catted DP / CS Turbo / Cobb AP / JBR OCC / JBR Thermal Intake Mani and Throttle Body gaskets / CPE EGR delete / Damond PCV plate / HTP 3.5 Intake and Battery Tray / Synapse DV /CS 3 Port EBCS / NGK Plugs Step Colder / CS HPFP Internals / TR8 FMIC w/ CX Racing Piping / Rear Trans Mount / 3 Bar Map Sensor / Bilstein B8's W/ CorkSport Springs / SPC Upper Ball joints / Gen-2 Stockers wrapped in Bridgestone RE760 Sports 225/45/18...Currently wrapped in Snow Tyres / Diamond Audio D3 12" with custom box/mounted / Rockford T500.1 Amp /[​IMG]
     

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  2. NavysailorMS3

    NavysailorMS3 Greenie Member

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    Try swapping fuel pump with someone to see if it is in fact your fuel pump that is bad. Its a cheap way to check.
     
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  3. Turbo

    Turbo Greenie Member

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    This is set up for Friday, just covering all my basis if its not the pump. Thanx NavySailerMS3
     
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  4. NavysailorMS3

    NavysailorMS3 Greenie Member

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    Keep us posted when you do this.
     
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  5. Turbo

    Turbo Greenie Member

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    Will do
     
  6. mOo_GiZzArD

    mOo_GiZzArD Greenie Member

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    its def that 12" sub and rockford amp... taggin along to see the outcome
     
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  7. Turbo

    Turbo Greenie Member

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    LOL right. I just copied my mod list and pasted. Prob didn't need to include that :D
     
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  8. monkey.bones.007

    monkey.bones.007 Chuckin' sausage like a hooker rubs dick Silver Member

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    You forgot your dildo mod.

    [​IMG]

    tapatalk, it sucks
     
    monkey.bones.007, via a mobile device, Feb 10, 2016
    #8
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  9. mOo_GiZzArD

    mOo_GiZzArD Greenie Member

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    better retune after that dildo mod.... dont want the car going all willy nilly.
     
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  10. KingScumbag

    KingScumbag Greenie Member

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    PRV?
     
    KingScumbag, via an iPhone, Feb 10, 2016
    #10
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  11. Rommel043

    Rommel043 Greenie Member

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    bad o ring?
    Untitled.jpg
     
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  12. Turbo

    Turbo Greenie Member

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    All O-rings are intact and uncut or blown out. Just got off the phone with Corksport, they feel its in the pressure valve on the rail. My tuner feels its on the HPFP side. I will swap pumps and go from there.
    [doublepost=1455131300][/doublepost]Bahahaha forgot about that pic.
     
  13. KingScumbag

    KingScumbag Greenie Member

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    If it's not the pump. I.e spill valve stuck, etc.

    I'm pretty sure it's the pressure relief valve.

    I had similar symptoms a couple years back.
     
    KingScumbag, via an iPhone, Feb 10, 2016
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  14. Turbo

    Turbo Greenie Member

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    Im sourcing new valve today. Figure it might just be time to replace it at 92K and E for last 6 months
     
  15. Disknkt

    Disknkt Greenie N00B Member

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    Saw this before and after swapping the spill valve, the HPFP, the relief valve and seals on the injectors with no effect it ended up being the fuel pressure sensor at the end of the rail. Might want to give that a try.
     
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  16. Turbo

    Turbo Greenie Member

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    If were talking about the sensor on the left side of the fuel rail then that sucks cuz I believe thats part of the fuel rail and is $493. If were talking Pressure valve thats gold on right side back of fuel rail then that is the valve I am working on sourcing now. Ill start cheap. If its the rail, I might be able to get it covered under warranty since its still OEM.
     
  17. monkey.bones.007

    monkey.bones.007 Chuckin' sausage like a hooker rubs dick Silver Member

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    @Shaun all Gold Member and stuff.
     
  18. Turbo

    Turbo Greenie Member

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    I like to strike early. ;)
     
  19. Disknkt

    Disknkt Greenie N00B Member

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    I was refering to the sensor on the left side. Not cheap.
     
    Disknkt, via a Nexus device, Feb 10, 2016
    #19
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  20. KingScumbag

    KingScumbag Greenie Member

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    You can actually find a used rail cheap. With the sensor still attached. Or maybe someone in your local group has one kicking around.
     
    KingScumbag, via an iPhone, Feb 10, 2016
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