Edmunds Answers

Voted Best Answer

  • avatar MrShift@Edmunds 09/29/11 1:10 pm PST

    You might check this out:



    Under any operating condition, except wide open throttle, the fuel pump gets voltage from the fuel pump relay via the fuel pump ballast resistor. When the vehicle is under a wide open throttle condition, the ballast bypass relay gets grounded (ENERGIZED) by the engine controller. When the ballast bypass relay gets ENERGIZED, voltage bypasses the fuel pump ballast resistor and full system voltage is applied to the fuel pump.

    Voltage to the ballast bypass relay is supplied through the fuel pump relay. The ballast bypass relay is located on a bracket connected to the power distribution center.

Answers

  • MrShift@Edmunds 09/29/11 1:10 pm PST

    You might check this out:



    Under any operating condition, except wide open throttle, the fuel pump gets voltage from the fuel pump relay via the fuel pump ballast resistor. When the vehicle is under a wide open throttle condition, the ballast bypass relay gets grounded (ENERGIZED) by the engine controller. When the ballast bypass relay gets ENERGIZED, voltage bypasses the fuel pump ballast resistor and full system voltage is applied to the fuel pump.

    Voltage to the ballast bypass relay is supplied through the fuel pump relay. The ballast bypass relay is located on a bracket connected to the power distribution center.

  • minfam 09/29/11 2:27 pm PST

    my jeep has four relays in a line, all identical. i cannot find a drawing showing which of the four is the fuel pump relay. can you help?

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