[SOLVED] Randomly loses fuel pressure

Discussion in 'Mazdaspeed 3 Troubleshooting' started by Brockm, Dec 7, 2022.

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  1. Brockm

    Brockm Greenie Member

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    Year/Make/Model: 2008 speed 3
    Mileage: unknown rebuilt by previous owner
    @Roger Mesler
    Location: ohio
    Concern: loses fuel pressure when throttle is inputed, doesn't make correct fuel pressure at idle
    Modifications: hpfp upgraded Internals, bnrs3 turbo, 2 aem fuel pumps and inline filters, it has a fuel cell because it has been converted to awd, front mount intercooler, Manley H beam rods and weisco pistons

    ECU/Tuning Software: Cobb Acessport
    Tuner: Freek Tune 93 bnrs3 (base tune)

    Recent Repairs: tried cleaning the hpfp Internals and the sensor on top
     

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    Last edited: Dec 9, 2022
    Brockm, via a mobile device, Dec 7, 2022
    #1
  2. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Have you tested the pressure relief valve?
     
    Easter Bunny, via a mobile device, Dec 9, 2022
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  3. Awafrican

    Awafrican Moderator Gold Member

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    I really need to put Sho's prv video in a fueling troubleshooting how to thread

    op here's how to test your PRV, with engine at temp
     
    Awafrican, via a mobile device, Dec 9, 2022
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  4. SyntheticAtmosphere

    SyntheticAtmosphere You only get ONE ride, ONE ticket, ONE time! Silver Member

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    Feel like you are repeating yourself....repeating yourself? LOL
     
  5. Brockm

    Brockm Greenie Member

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    I just put a new prv on it and still having the same issues
     
    Brockm, via a mobile device, Jan 30, 2023
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  6. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Did you ever test the old prv to see if it was bad?
     
    Easter Bunny, via a mobile device, Jan 30, 2023
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  7. Brockm

    Brockm Greenie Member

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    No, just bought a new one because with minimal fuel pressure I don't want to run it long enough to warm up, and bought a new one
     
    Brockm, via a mobile device, Jan 30, 2023
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  8. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Did you use an oem sensor and replace the entire rail? Is the one on there now working correctly?

    You could have idled for as long as needed on the old one.
     
    Easter Bunny, via a mobile device, Jan 31, 2023
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  9. Brockm

    Brockm Greenie Member

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    It was hard to get it to start on the old one replaced the prv and the new one doesn't seem to want to start but it will randomly go up to 500, 700 and 1000 psi on different start up attempts most of the time it is in the mid 60's
     
    Brockm, via a mobile device, Jan 31, 2023
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  10. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    mid 60s is the in tank pressure only, something is wrong with the HPFP
     
  11. Brockm

    Brockm Greenie Member

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    Sometimes it reaches more than mid 60's which is why I'm trying to narrow it done to something before I throw a HPFP at it.
     
    Brockm, via a mobile device, Jan 31, 2023
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  12. Awafrican

    Awafrican Moderator Gold Member

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    Awafrican, via a mobile device, Jan 31, 2023
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  13. SyntheticAtmosphere

    SyntheticAtmosphere You only get ONE ride, ONE ticket, ONE time! Silver Member

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    Try Read this. You might understand better how the HPFP works and therefore what the issue could be.
     
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  14. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Fixing the hpfp doesn't necessarily mean a whole new one. Most of the time a good service will get it back to working order
     
    Easter Bunny, via a mobile device, Jan 31, 2023
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  15. Brockm

    Brockm Greenie Member

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    I took the pump apart, the retainer clip that goes above the spring and holds the keepers, Is there a website where I can get a new one
    Mine got lost in the disassembly process
     
    Brockm, via a mobile device, Feb 5, 2023
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  16. Brado

    Brado Problem Encounterer Greenie Member

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    Did you ever figure out your fueling issue?
     
  17. Brockm

    Brockm Greenie Member

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    HPFP needed rebuilt runs alot better now


    SOLVED
     
    Brockm, via a mobile device, May 10, 2023
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