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Thread: Leak from high pressure fuel line at fuel rail

  1. #1

    Array
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    Offline
    Join Date
    03-16-2021
    Posts
    12
    Location

    Lafayette, La.
    Vehicle

    1991 Mitsubishi Mighty Max
    Engine

    4G64

    Fuel leak on the side of the road

    Posting from Hwy 14 in New Iberia, La. I have a 1991 base model that started losing power. When I stopped, I smelled gas and saw a leak. I took a picture of it. Any suggestions? Thanks! Ok, never mind. The damned file will not upload. It is where the fuel line connects with two screws to the carb on the top driver's side of the engine.

  2. #2

    Array
    Status
    Offline
    Join Date
    03-16-2021
    Posts
    12
    Location

    Lafayette, La.
    Vehicle

    1991 Mitsubishi Mighty Max
    Engine

    4G64

    Leak from high pressure fuel line at fuel rail

    Hi guys,
    I just got this 1991 Mitsubishi Mighty Max base model, 2.4 L, so excuse my ignorance. I lost power and managed to get the truck off the street, but it was missing and clunking the whole way. The high pressure fuel line, where it meets the fuel rail, was leaking. There was a strong smell of gas, and I could see the gas pooled in the tops of the two screws that hold the line to the rail.
    What is the next step? I'm reading through the Haynes manual, but they don't list fuel leak as one of the troubleshooting indicators. Any suggestions?
    I will try again to upload the photo I shot of the situation. It wouldn't let me upload it from my phone earlier (when I still thought I had a carburetor).
    Attached Images

  3. #3

    Array
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    03-16-2021
    Posts
    12
    Location

    Lafayette, La.
    Vehicle

    1991 Mitsubishi Mighty Max
    Engine

    4G64
    UPDATE: Well, the weekend was a learning experience. I replaced the o-ring at the connection of the high pressure line and the fuel rail and solved the leak, but that was not the problem. Turns out the alternator was only putting out 11.4 volts instead of 14.5, so the injectors were not firing, the battery wasn't charging and the coil wasn't getting enough juice. Found the only alternator available east of Houston and replaced it, along with the engine grounding strap that had corroded out. Now the truck runs like new.

  4. #4


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    05-01-2018
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    1,549
    Location

    Kailua, HI
    Vehicle

    1986 Dodge Power Ram 50
    Engine

    G54B
    Love it man ~ way to go ~ what made you think alternator ??

  5. #5

    Array
    Status
    Offline
    Join Date
    03-16-2021
    Posts
    12
    Location

    Lafayette, La.
    Vehicle

    1991 Mitsubishi Mighty Max
    Engine

    4G64
    When I realized that the engine ran smoothly after the fuel leak was fixed — until I disconnected the jump battery pack. When it had to depend on the alternator, it started running rough again.

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