Bubbles in Davco

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by me myself and I, Oct 20, 2019.

  1. me myself and I

    me myself and I Medium Load Member

    603
    236
    Oct 5, 2009
    vernon hills,Il
    0
    New plastic ring, cap and o ring. Ive reinstalled it 4 times, and twice by diffrent mechanics. Fuel lines are dry. The shut off valves are dry(Cascadia). I shut off each tank for some 15 min, and still had bubbles. Any tips?
     
  2. tnevin225

    tnevin225 Road Train Member

    1,040
    1,358
    Jan 1, 2014
    0
    Possible crack in fuel tank pick up tube?
     
  3. Tx Countryboy

    Tx Countryboy Road Train Member

    1,571
    3,201
    Sep 18, 2019
    0
    David website says some bubbles normal.
     
  4. swaan

    swaan Road Train Member

    2,688
    3,627
    Jul 12, 2009
    BC canada
    0
    Check the drain valve at the bottom of the davco. Both fittings going in and out of unit also.
     
  5. Smellfunny

    Smellfunny Heavy Load Member

    930
    405
    Jan 28, 2012
    South Carolina
    0
    Also check your anti-drain back valve or check valve on the supply side located on the filter housing. I have seen trash get in there and allow it to flow back some. Other than that maybe remove the supply line and hold your finger over the hole and fill it with fuel and see if it still bubbles. That way you will know which way to go.
     
    Mike250rs Thanks this.
  • Draft saved Draft deleted