What causes the pressure in the fuel tank to build up enough to blow the rubber line off the fuel pump outlet port?

4 Answers

  • 5 months ago

    A missing clamp on the fuel line and or stuck fuel regulator.

  • Gabe
    Lv 6
    5 months ago

    You want the quick and dirty version or the long complicated physics version?

  • 5 months ago

    There's not enough pressure in the gas tank to do that.

    The fuel pump puts out 50 to 70 PSI. You just had a bad fuel line or possibly a plugged return line.

    Source(s): Mitsubishi Master Tech
  • Dan
    Lv 4
    5 months ago

    A stuck fuel pressure regulator. The pressure isn't going high in the tank, it's going high in the line. The FPR allows fuel to bleed back to the tank once it reaches a certain pressure designed into the FPR, let's say 40 psi for argument's sake. If the regulator gets stuck the fuel pump can drive line pressure up around 100 psi.

    • Joe S5 months agoReport

      Thanks Dan , I just could not understand how the tank could possibly pressurize without rupturing the seams, now I know which direction to proceed. Thanks again.

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