1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Fuel filter heater terminal leaking

Discussion in '6.9L IH & 7.3L IDI Diesels' started by harrietnorth, Dec 10, 2019.

  1. harrietnorth

    harrietnorth Registered User

    Posts:
    28
    Likes Received:
    5
    Joined:
    Nov 15, 2016
    Location:
    Buffalo MN
    The terminal on the top of my fuel filter is leaking. This seems to me a common problem.

    Anyone have a procedure for fixing this issue?

    My NA fires right up cold, runs for a few seconds, dies, and then I need to crank til the fuel comes back. After that runs fine. Smacks of air intrusion and I’ve replaced everything from returns lines back to the filter. Injectors are dry, the filter assembly is the only leak I can find.

    I did a quick scan of the idi tech articles and nothing popped up.

    My thoughts were to take the whole shebang apart, clean and then JB Weld...

    Thoughts?
     
  2. 420Bullnose

    420Bullnose Registered User

    Posts:
    10
    Likes Received:
    7
    Joined:
    Jun 8, 2019
    Location:
    U.S.A.
    Is your IDI the 6.9 or 7.3?, I heard of people who got a 7.3, swap the 6.9 Fuel Filter Housing in, to solve their problem. Other then that, it's probably just an O-ring that needs to be replaced.
     
    Last edited: Dec 10, 2019
  3. Philip1

    Philip1 Full Access Member

    Posts:
    72
    Likes Received:
    50
    Joined:
    Apr 1, 2019
    Location:
    Nevada
    What people tend to do is remove the fuel heater then plug the hole with a 1/2" pipe plug

    Sent from my SM-G975U using Tapatalk
     
    dgr likes this.
  4. Grady J

    Grady J Registered User

    Posts:
    37
    Likes Received:
    6
    Joined:
    Mar 16, 2017
    Location:
    Ogden Utah
    I had this issue and i just replaced the o-ring and it fixed the problem, $1.60 plus shipping from dieselOrings.com
     
  5. harrietnorth

    harrietnorth Registered User

    Posts:
    28
    Likes Received:
    5
    Joined:
    Nov 15, 2016
    Location:
    Buffalo MN
    [​IMG]

    7.3 NA.

    Here’s a photo.

    I suppose I need to tear the whole thing out and get in on the bench to do an o-ring replacement or some such?
     
  6. 1992 idi 73

    1992 idi 73 Registered User

    Posts:
    31
    Likes Received:
    15
    Joined:
    Apr 11, 2019
    Location:
    Mason ohio
    I just went through the same thing these o-rings will solve that problem instantly. Worst part of it is re-bleeding everything once your done. Also change your fuel filter while your at it.
     
  7. Richard Wear

    Richard Wear Registered User

    Posts:
    6
    Likes Received:
    2
    Joined:
    Apr 26, 2019
    Location:
    Missoula Montana
    Does the fuel heater aid in cold weather starts? If so I would keep it stock.
     
  8. franklin2

    franklin2 Full Access Member

    Posts:
    3,920
    Likes Received:
    504
    Joined:
    Feb 24, 2009
    Location:
    Va
    There are some good you-tube videos on this that show you how to take it apart. It's somewhat of a pain. I had the same problem. Took it all apart and replaced the o-ring. About a year later it started leaking again. Someone on here said a guy (was he the one that passed away?) took his and just put jb weld over it and it never leaked again. Not wanted to go through all that teardown again, that is what I did. I took brakecleaner and cleaned it up really good. Dried it out, and then mixed up some jb weld and covered the whole thing over. Hasn't leaked, didn't need to tear it down, and it's been good for a couple of years so far.

    By the way, that is your air intrusion leak causing the starting problems.
     
  9. IDIBRONCO

    IDIBRONCO IDIBRONCO

    Posts:
    4,686
    Likes Received:
    2,999
    Joined:
    Feb 5, 2010
    Location:
    edmond, ks
    In theory, yes. In practice, not really (if anything). The problem with this is the location. It's at the top of the fuel filter, on top of the fuel. Since heats rises, it's not really effective.
     
  10. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

    Posts:
    8,103
    Likes Received:
    6,550
    Joined:
    Jul 27, 2015
    Location:
    Bulverde, Texas
    On the flip side, the fuel heater actually will lead to less fuel output and can intensify hot starting issues during the summer on a high mileage injection pump.
     
    harrietnorth and lotzagoodstuff like this.
  11. IDIBRONCO

    IDIBRONCO IDIBRONCO

    Posts:
    4,686
    Likes Received:
    2,999
    Joined:
    Feb 5, 2010
    Location:
    edmond, ks
    Makes perfect sense. I never would have thought of that.
     
    harrietnorth likes this.
  12. Richard Wear

    Richard Wear Registered User

    Posts:
    6
    Likes Received:
    2
    Joined:
    Apr 26, 2019
    Location:
    Missoula Montana
    So would the 6.9 filter top be an improvement over 7.3?
     
  13. IDIBRONCO

    IDIBRONCO IDIBRONCO

    Posts:
    4,686
    Likes Received:
    2,999
    Joined:
    Feb 5, 2010
    Location:
    edmond, ks
    I don't think it would be. I think it's kind of "six of one, a half dozen of the other".
     

Share This Page