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2000 W900L 6nz caterpillar good fuel mileage but poor up hill performance!!!

Discussion in 'Kenworth Forum' started by 6nz-kw, Jul 29, 2014.

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  1. Jul 29, 2014 #1
    6nz-kw

    6nz-kw Bobtail Member

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    Dec 28, 2013
    Jamestown OH/Holly Hill FL
    0
    I believe it has a fuel line problem,could it be the lines from the tanks to the fuel block going bad? Does 6.5 to 7mpg,but m11,and 11.1 60 series,could kick it's but going up hills !!!
     
    6nz-kw, Jul 29, 2014
    6nz-kw, Jul 29, 2014
    #1
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  3. Jul 30, 2014 #2
    BeenJammin

    BeenJammin Light Load Member

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    Dec 17, 2013
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    Must just be running on two cylinders, joking. Have programming checked to see if soft accelerator and soft cruise is turned on. If not, what kind of boost pressure is it putting out, if you have manifold pressure gauge. Fuel pressure? ATAAC leak? Turbo waste gate plate stuck open? Turbine fin damage on turbo. Do you have a pyrometer? What are egt readings? Overhead adjustments way out of whack? Take it to a good reputable tuner and let them check it out. M11 and 11.1, you should only see them briefly as you pass them, smiling, all the while.
     
    BeenJammin, Jul 30, 2014
    BeenJammin, Jul 30, 2014
    #2
    6nz-kw Thanks this.
  4. Jul 30, 2014 #3
    6nz-kw

    6nz-kw Bobtail Member

    48
    13
    Dec 28, 2013
    Jamestown OH/Holly Hill FL
    0
    Thanks for the advice!I have a grand rock true dual exhaust aerocab kit,and I have a robsredford 600hp American brakesaver tune,fuel temp harness,5232 injector codes,and 74 and-19 fls,fts fuel#s,this really didn't do nothing for the truck,I'm "not"saying his work is bad,he knows his caterpillars,but when he told me to switch to the fleetguard fs1023 fuel filter,that's when it woke up a little bit,and that's why I think I've got fuel lines going bad!
     
    6nz-kw, Jul 30, 2014
    6nz-kw, Jul 30, 2014
    #3
  5. Jul 30, 2014 #4
    baha

    baha Road Train Member

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    2,834
    Jul 25, 2013
    ga
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    The fitting under filter was known to be way to small, ck. if it has been updated.
     
    baha, Jul 30, 2014
    baha, Jul 30, 2014
    #4
    6nz-kw Thanks this.
  7. Jul 30, 2014 #5
    6nz-kw

    6nz-kw Bobtail Member

    48
    13
    Dec 28, 2013
    Jamestown OH/Holly Hill FL
    0
    Thanks baha,yes the filter head has been updated! The injector height adjustment was found to be 2 full turns past the rite setting,with a cat injector height tool,it was found,and corrected by a kenworth,and caterpillar expert from N.Carolina! Could this possibly be what is causing my pulling power to suffer?Now remember,I'm getting killer good fuel mileage though!
     
    6nz-kw, Jul 30, 2014
    6nz-kw, Jul 30, 2014
    #5
  8. Jul 30, 2014 #6
    BeenJammin

    BeenJammin Light Load Member

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    Dec 17, 2013
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    I wasn't familiar with the fs 1023, but from what I read, it's nothing more than a wire mesh screen with no water separation capability, other than settling by specific gravity. That would worry me, because your injectors don't live long compressing water. Back to your fuel issue, do you have a restriction gauge plumbed in to the line at your filter base where the 1023 is? Are you running the factory KW setup, or do you have a modified system? I would want to see what your fuel pressure is, outbound to cylinder head, when you are boosted up and pulling. Restriction gauge will tell you what's going on before the pump, pressure gauge will tell you what's going on after final filter to fuel gallery in head. Process of elimination, also, outbound pressure could be falling off from weak check valve on return, etc. Does engine start o.k. after setting over night? If you suspect fuel lines, rig you up a fuel hose where the suction line goes into first filter, and run the other end to tank via fuel cap opening and secure it where it wont come out while driving. Get it reprimed and go for a road test to see what happens.
     
    BeenJammin, Jul 30, 2014
    BeenJammin, Jul 30, 2014
    #6
    6nz-kw Thanks this.
  9. Jul 30, 2014 #7
    6nz-kw

    6nz-kw Bobtail Member

    48
    13
    Dec 28, 2013
    Jamestown OH/Holly Hill FL
    0
    Thanks,got factory kw setup,but with a few 45 degree fittings,restriction gauge would go to 4-5,with a fs1000 filter,and now 0-1 with fs1023,engine starts great,no misses,air filters are always changed often,and I'm getting 85-90psi at idle,and I've never done any of the other checks,but I will start,here in a few days from now,thanks for the info,and I'll let you know,what I come up with!
     
    6nz-kw, Jul 30, 2014
    6nz-kw, Jul 30, 2014
    #7
  10. Jul 30, 2014 #8
    Dryver

    Dryver Road Train Member

    2,818
    2,573
    Nov 30, 2008
    Sioux Falls, SD
    0
    Check vents on the fuel tanks. Maybe fuel pump can pull against the vacuum for cruising speed but when you ask for more it can't vent the tank quickly enough. Quick and cheap to check.
     
    Dryver, Jul 30, 2014
    Dryver, Jul 30, 2014
    #8
    6nz-kw Thanks this.
  11. Aug 1, 2014 #9
    6nz-kw

    6nz-kw Bobtail Member

    48
    13
    Dec 28, 2013
    Jamestown OH/Holly Hill FL
    0
    Thanks Dryver,I clean them out quite often,I'm beginning to wonder,if the fuel transfer pump on the front of the motor,is the culprit,it was shimmed,but it didn't seem to help one bit!
     
    6nz-kw, Aug 1, 2014
    6nz-kw, Aug 1, 2014
    #9
  12. Aug 1, 2014 #10
    Oscar the KW

    Oscar the KW Going Tarpless

    12,246
    28,113
    May 19, 2011
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    If the fuel lines have never been replaced, I would replace them, over time they start to swell and will restrict fuel flow.
     
    Oscar the KW, Aug 1, 2014
    Oscar the KW, Aug 1, 2014
    #10
    6nz-kw Thanks this.
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