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3406E Losing Prime

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by RollinCoal02, Jan 31, 2018.

Page 1 of 3
  1. Jan 31, 2018 #1
    RollinCoal02

    RollinCoal02 Bobtail Member

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    Dec 28, 2016
    Green Bay, WI
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    I have a 3406E that I cant keep prime in the fuel system. Heres everything I did.
    • Replaced Head because it was cracked
    • Replaced all injector o-rings
    • replaced fuel filter base
    • tried multiple new primer pumps
    • new cat fuel filters
    • new fuel lines from tank to engine
    • replaced the fuel check valve
    • as a last ditch effort we put a check valve in at the top of the suction tube on the fuel tank to prevent any fuel from running back into the tank. Nothing has remedied the issue
    The truck will fire up no problem. Then after 30 sec to a minuet of running it will start cutting out and running out of fuel. Pumping the primer clears it up right away, but wont run on its own until the primer is hard. The fuel water separator ends up not being full if you shut the truck off when its running out of fuel and pull the filters off. The only thing I haven't done is check fuel pressure. I am in the process of gathering fittings to check.
    Any help would be appreciated thanks!
     
    RollinCoal02, Jan 31, 2018
    RollinCoal02, Jan 31, 2018
    #1
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  3. Jan 31, 2018 #2
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Do you have a manual fuel restriction gauge in dash? I have seen them go bad or hose go bad and pull in air on fuel suction side. Usually only causes problems when you do a filter change.
     
    spsauerland, Jan 31, 2018
    spsauerland, Jan 31, 2018
    #2
    Oxbow and SAR Thank this.
  4. Jan 31, 2018 #3
    Superhauler

    Superhauler TEACHER OF MEN

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    Didn't see anything about the transfer pump being replaced. Check fuel pressure first. If low below 75 at idle then it could be transfer pump or sucking air some where. Some one mentioned checking the tank breathers to see if they are plugged causing a vacum.
     
    Superhauler, Jan 31, 2018
    Superhauler, Jan 31, 2018
    #3
    Oxbow and SAR Thank this.
  5. Jan 31, 2018 #4
    swaan

    swaan Road Train Member

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    Check your secondary filter housing on frame also.. could be cracked or bad fitting or O ring. Letting it drain back over night
     
    swaan, Jan 31, 2018
    swaan, Jan 31, 2018
    #4
    Oxbow and SAR Thank this.
  7. Jan 31, 2018 #5
    swaan

    swaan Road Train Member

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    Givin the fact it starts fine and runs for 30 seconds to a min leads me to believe for certain the problem is on the suction side of the fuel system.

    Transfer pump or secondary filter housing

    Screw on an empty secondary and that's exaclly what will happen.
    Check the O ring boss fittings on housing.
     
    swaan, Jan 31, 2018
    swaan, Jan 31, 2018
    #5
    Oxbow Thanks this.
  8. Jan 31, 2018 #6
    spsauerland

    spsauerland Road Train Member

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    We all know you mean primary filter! Very sound advice.
     
    spsauerland, Jan 31, 2018
    spsauerland, Jan 31, 2018
    #6
    Oxbow and easytopleez33 Thank this.
  9. Jan 31, 2018 #7
    swaan

    swaan Road Train Member

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    Ya that' is another topic . Lol

    Secondary/ primary. You guys know what I meant.
     
    swaan, Jan 31, 2018
    swaan, Jan 31, 2018
    #7
    Oxbow and easytopleez33 Thank this.
  10. Jan 31, 2018 #8
    windsmith

    windsmith Road Train Member

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    Does the fuel run through the ECM
    Best way to check the tank breathers is to leave a fuel cap off.

    But I agree, it sounds like there's air entering the system on the suction side.
     
    windsmith, Jan 31, 2018
    windsmith, Jan 31, 2018
    #8
    Oxbow Thanks this.
  11. Jan 31, 2018 #9
    Superhauler

    Superhauler TEACHER OF MEN

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    keep stroking.
    0
     
    Superhauler, Jan 31, 2018
    Superhauler, Jan 31, 2018
    #9
  12. Jan 31, 2018 #10
    windsmith

    windsmith Road Train Member

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    lol that quote and paste didn't work out right...
     
    windsmith, Jan 31, 2018
    windsmith, Jan 31, 2018
    #10
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