Fuel recycle return line valve

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Drow88, Aug 29, 2018.

  1. Aug 29, 2018 #1
    Drow88

    Drow88 Bobtail Member

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    Seem to be getting air in fuel system. Changed lines from primary fuel filter to new transfer pump and back to tank as well . Left the recycle return line valve shut off and truck seems to run better..can I leave it off? 3406e caterpillar '04 -379.
     
    Drow88, Aug 29, 2018
    Drow88, Aug 29, 2018
    #1
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  3. Aug 29, 2018 #2
    REALITY098765

    REALITY098765 Road Train Member

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    NO. You are probably overfueling the engine. Makes more power but could wash down the cylinder walls.
     
    REALITY098765, Aug 29, 2018
    REALITY098765, Aug 29, 2018
    #2
    Drow88 Thanks this.
  4. Aug 29, 2018 #3
    Drow88

    Drow88 Bobtail Member

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    Ok thanks. .hunting this down has been something. .loss of power,excessive exaust emissions. .
     
    Drow88, Aug 29, 2018
    Drow88, Aug 29, 2018
    #3
  5. Aug 29, 2018 #4
    Lepton1

    Lepton1 Road Train Member

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    Subscribed.
     
    Lepton1, Aug 29, 2018
    Lepton1, Aug 29, 2018
    #4
  7. Aug 29, 2018 #5
    swaan

    swaan Road Train Member

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    What engine do you have exactly.

    04 pete and 3406E dont go together
     
    swaan, Aug 29, 2018
    swaan, Aug 29, 2018
    #5
  8. Aug 29, 2018 #6
    Drow88

    Drow88 Bobtail Member

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    Yes it does MBN bridge motor c15
     
    Drow88, Aug 29, 2018
    Drow88, Aug 29, 2018
    #6
  9. Aug 29, 2018 #7
    swaan

    swaan Road Train Member

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    Do not shut the return off.
    You will run the risk of blowing your O rings on the injectors from too much fuel pressure.
     
    swaan, Aug 29, 2018
    swaan, Aug 29, 2018
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    Drow88 Thanks this.
  10. Aug 29, 2018 #8
    Drow88

    Drow88 Bobtail Member

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    Turned it back to on position..thanx
     
    Drow88, Aug 29, 2018
    Drow88, Aug 29, 2018
    #8
  11. Aug 29, 2018 #9
    swaan

    swaan Road Train Member

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    Then it's not a 3406E like you said. It's a c-15 . There is a diffrence and trying to diagnose something when you got the right info is half the battle.

    Now then, tell us how you figure you have air in your fuel?
     
    swaan, Aug 29, 2018
    swaan, Aug 29, 2018
    #9
    Goodysnap Thanks this.
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