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Cat running rough, air in fuel line..

Discussion in 'Trucks [ Eighteen Wheelers ]' started by kwforage, Apr 11, 2009.

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  1. Apr 12, 2009 #31
    kwforage

    kwforage Road Train Member

    1,047
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    Jun 3, 2007
    Wisconsin
    0
    the only thing making me think it's not a bad fuel issue is that my brothers truck sat right next to mine all winter and he has no problems at all.
     
    kwforage, Apr 12, 2009
    kwforage, Apr 12, 2009
    #31
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  3. Apr 13, 2009 #32
    Les2

    Les2 Road Train Member

    5,150
    2,288
    Jul 25, 2008
    kicked back in my lazyboy...
    0
    Gotcha.....:thumbright:
     
    Les2, Apr 13, 2009
    Les2, Apr 13, 2009
    #32
  4. Apr 13, 2009 #33
    pullingtrucker

    pullingtrucker Road Train Member

    1,185
    598
    Dec 21, 2008
    Fostoria, Ohio
    0
    The ultra low sulphur diesel does have a shelf life...sort of. It will grow bacteria, fungus, or whatever you want to call it in very short order. Even with constant operation of a vehicle the micro-organisms can start to develope. It all depends on heat, water, and a couple of other factors. To be safe I shock treat my tanks about every 2-3 months unless I see anything in my filters which I then treat.

    But in kwforage's case I would have to say it may be a combitnation of things. Old fuel (that probably isn't treated) and bad fuel lines. Many guys don't want to either admite it or believe that fuel lines swell and go bad.
     
    pullingtrucker, Apr 13, 2009
    pullingtrucker, Apr 13, 2009
    #33
  5. Apr 13, 2009 #34
    kwforage

    kwforage Road Train Member

    1,047
    472
    Jun 3, 2007
    Wisconsin
    0
    Looked it over good again today. I noticed as I primed it I could hear an air leak coming from the bottom of the water seperator, it doesn't leak fuel, but does have an air leak. Got a new seal on it's way. I am hoping fixing this will fix it. It also kind of seemd as if the fuel line coming out of the seperator had really small bubbles coming right through the line when I flexed it. I'll try fixing the seperator leak, and then throw a new hose on if that doesn't work
     
    kwforage, Apr 13, 2009
    kwforage, Apr 13, 2009
    #34
  7. Apr 13, 2009 #35
    05chopper

    05chopper Light Load Member

    169
    22
    Dec 25, 2008
    USA
    0
    Close to the lower front cover below the fuel injection pump is the transfer pump.Remove this large fuel suction line 15/16 wrench I think.Then get a short fuel line hook it back up to the transfer pump and drop the other end into a bucket of fuel. Pump up the hand primer pump till it gets hard and keep pumping it while someone starts it.If it runs good then you picking up air getting into filter area.Also check the return fuel line from the fuel pump to the fuel tank.Hose is a number 4 strato-flex hose line it can plug shut. If your hand primer pump wont get hard then your check valves inside are flipped over or leaking.
     
    05chopper, Apr 13, 2009
    05chopper, Apr 13, 2009
    #35
  8. Apr 13, 2009 #36
    dicky

    dicky Bobtail Member

    31
    8
    Aug 16, 2008
    st.paul , mn.
    0
    bingo!!!! We have a winner !!!
     
    dicky, Apr 13, 2009
    dicky, Apr 13, 2009
    #36
  9. Apr 15, 2009 #37
    dicky

    dicky Bobtail Member

    31
    8
    Aug 16, 2008
    st.paul , mn.
    0
    how about an update ?
     
    dicky, Apr 15, 2009
    dicky, Apr 15, 2009
    #37
  10. Apr 16, 2009 #38
    Six8888

    Six8888 Bobtail Member

    16
    0
    Apr 16, 2009
    Fontana, Ca
    0
    Do not put ATF in the fuel tank. You either have an air line with a bad fitting or a hole in the line sucking air in the sys, thats why you'ree losing prime. Also you could have bad inj o-ring seals causing air in the sys.

    Robert

    Night Service manager LA Freightliner-Fontana
     
    Six8888, Apr 16, 2009
    Six8888, Apr 16, 2009
    #38
  11. Apr 16, 2009 #39
    kwforage

    kwforage Road Train Member

    1,047
    472
    Jun 3, 2007
    Wisconsin
    0
    WWWWWWWWOOOOOOOOOOOOHHHHHHHHHHHOOOOOO:biggrin_255::biggrin_255:

    FIXED IT!! Just went and worked on it a couple hours ago. It was the steel canister on the primary filter. There is a seal on the bottom that was sucking air in. I found the leak a few days ago and in the process of trying to bleed the air out I ended up stripping a bolt on the mount for the secondary filter. :biggrin_25516: So I order a new mount and new canister. ( I see the new canister is completly welded on the bottom, no seal) They came in today and I put them on along with another new filter. After lots of priming she started up and runs like a champ. I was starting to get worried that I was going to be dropping alot of cash on some injector work, but ended up fixing it for only about $150 ($100 of which was the filter base which I ruined out of stupidity)

    Thanks to everyone for all of the ideas.
     
    kwforage, Apr 16, 2009
    kwforage, Apr 16, 2009
    #39
  12. Apr 19, 2009 #40
    raysraid

    raysraid Bobtail Member

    1
    0
    Apr 19, 2009
    cynthiana ky
    0
    put a new filter in and all of fitting
     
    raysraid, Apr 19, 2009
    raysraid, Apr 19, 2009
    #40
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