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Thread: Fuel testing

  1. #26
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    This is exactly what i was talking about. He can search the EVOM.net forum to see exactly how they wire it up. I know It's from the battery with an inline fuse then a hobbs switch that is boost activated. It has provided the best results for the higher HP cars. Then again they're not DI and don't have HPFPs either.

    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    Switching from a 20 to 25 amp fuse will probably not be a problem, but it is impossible to say because we don't know the gauge of the stock wiring. And then there is the fuel pump control module, which would probably be the first thing to fail.

    A boost activate switch to turn on the second pump would make the most sense to me. The second pump should be powered from a dedicated circuit using a fuse as close to the battery as possible. Depending on the current rating of the boost activated switch, a relay might be necessary.
    2011 335is DCT, moving to Italy, looking for new car friends Click here to enlarge

  2. #27
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    A Weldon fuel pump controller would work well for this as well, but i dont know how the car would react to not having the EKPS run the fuel pump and know its speed.

    i know a fault/CEL/MIL whatever you want to call it would occur lol
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  3. #28
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    This is exactly what i was talking about. He can search the EVOM.net forum to see exactly how they wire it up. I know It's from the battery with an inline fuse then a hobbs switch that is boost activated. It has provided the best results for the higher HP cars. Then again they're not DI and don't have HPFPs either.
    The high pressure pump is a completely different animal, but if he is having low pressure quality problems, then this should work.
    Eppur si muove.

  4. #29
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    you missed his point, hes talking about low pressure system
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  5. #30
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    you missed his point, hes talking about low pressure system
    I know, I was just saying the high pressure stuff makes fueling the N54 more challenging than a port injected vehicle, and that two electric low pressure pumps in parallel will help low pressure problems, which the OP is investigating.
    Eppur si muove.

  6. #31
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    yeah im going to at least try a 25A fuse if that works then im happy if not ill look into doing a methanol like circuit on the jb4 for the secondary fuel pump
    Turbo lag is the on ramp to the highway which is power.

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