3406 b model engine flooding with fuel

Discussion in 'Peterbilt Forum' started by mrc_83, Nov 10, 2021.

  1. mrc_83

    mrc_83 Bobtail Member

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    Nov 10, 2021
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    Wassup everyone. I have a 379 Pete 1993 with a 3406b model and my engine is flooding with diesel. Took it to the shop and had one bad injector so I changed them all. Supposedly that was the problem but it’s still filling up. Anyone had this problem before or have any advice?
     
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  3. MLC Adventures

    MLC Adventures Medium Load Member

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  4. Roger McG

    Roger McG Light Load Member

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    please explain flooding with fuel. Cylinder filling with fuel ,slobbering fuel at exhaust manifold,Cylinder hydrolocking with engine off???
     
    shooter19802003 and Bean Jr. Thank this.
  5. Oxbow

    Oxbow Road Train Member

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    The 90 degree fitting coming off of the back of the injection pump, and where the return fuel line connects, has a tiny orifice in it. This can get plugged and cause fuel pressure to go way up. I am not sure what happens if this is plugged, or what you mean by flooding with fuel, but it doesn't cost anything to check.
     
    Roger McG, shooter19802003 and cke Thank this.
  6. Oxbow

    Oxbow Road Train Member

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    Is fuel getting into the oil?
     
  7. SmokinCAT

    SmokinCAT Road Train Member

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    Restricted pump return will blow the side plate gasket out, a plunger would need to fail before the fuel could make it through the pump to the crankcase.

    Its likely a line under the rocker covers is leaking if the nozzles were replaced.
     
    AModelCat and Oxbow Thank this.
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