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2011 Tundra 5.7 - Voltage Drop 0.9 at Fuel Pump

Discussion in 'Electrical' started by xinoki, Mar 19, 2022.

  1. Mar 19, 2022 at 5:30 PM
    #1
    xinoki

    xinoki [OP] New Member

    Joined:
    Nov 16, 2018
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    I am looking for any help. I have a 0.9 Voltage loss on the power side when performing Voltage Drop test at the Fuel Pump. I trace the loss to the Fuel Pump Control Module and then to going into the ECM. Same consistent Voltage drop. Going from the battery to the ECM (following Fuel Pump Relay and others) everything seems to check out correctly. I have performed the Fuel Pump Control Circuits. All seems clear. I have visually checked the the connectors and wires, nothing looks damaged.

    My fuel pump recently went out. I am not sure if this voltage loss caused it to go bad over time. Any help appreciated, thanks.
     
  2. Mar 27, 2023 at 12:46 PM
    #2
    e30cabrio

    e30cabrio I'm e30cabrio, I'm a modaholic

    Joined:
    Oct 20, 2017
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    West Valley, Phoenix, Az.
    Vehicle:
    2010 Crewmax, 2013 Sequoia Limited
    Sequoia LED Headlights! D.T. L.T. headers, dual exh., BDX, S&B intake, 2018 seat skins.
    I think I may have a voltage issue on a new Walbro 450. Any input on getting more voltage to the pump would be appreciated.
     
  3. Mar 29, 2023 at 10:07 AM
    #3
    xinoki

    xinoki [OP] New Member

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    I ended up replacing the fuel pump and voltage was good after that.
     

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