Trucking Jobs New Driver Jobs Flatbed Jobs Tanker Jobs Refrigerated Jobs Auto Hauler Jobs
Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    Bobtail Member
    Member Since
    Aug 2009
    Location
    oklahoma
    Trucker?
    No Answer
    Posts
    3
    Thanks
    0
    Thanked: 0 Times

    14.0 detroit 515 help, 4.1mpg is killing me

    The truck is a 05' Xl Freightliner, specs are 480k miles, 3.55, 13 speed .78 over with 22.5 rubber, an a 14.0 515 detroit.

    My driver is complaining of low power and on the best mpg average its getting 4.3. I have it governed to 68 and it hauls a 48' flat.

    I have had it back to the Freightliner shop 2 times and they say that all is good that it driver and not the truck. But he came from my 03' Xl with a 500 detroit set to the 68 mph getting 6 mpg.

    I'm at the point where I will do better parking the truck than dealing with the bad mpg.

    Is anybody else having these issues or have ideas on where to look?

    Last edited by jayz8886; 11.02.2009 at 01.11 AM.

  2. #2
    Light Load Member
    Member Since
    Jan 2008
    Location
    somewhere
    Trucker?
    8 Years
    Posts
    294
    Thanks
    149
    Thanked: 36 Times
    have you checked for boost leaks?

  3. #3
    Light Load Member
    Member Since
    Aug 2009
    Location
    Portland, Or
    Trucker?
    7 Years
    Posts
    183
    Thanks
    46
    Thanked: 49 Times
    Put it on a dyno and go from there. $150 is cheaper than wasting it in fuel.

  4. #4
    Medium Load Member
    Member Since
    Jan 2009
    Location
    British Columbia
    Trucker?
    5 Years
    Posts
    346
    Thanks
    1
    Thanked: 100 Times
    I posted in a similar thread of mine that I have a friend with a Classic and a 14.0L Detroit, his fuel mileage is horrid. He is running 3:70 or 3:90 rear ends, cant remember, 13 speed, 22.5 rubber. He drives between 100 and 110 KM/H, pulls heavy one way, and very light the other, and his fuel mileage is horrid, usually in the 4's.

    Freightliner says it is working right.

    My suggestion is, take it to Detroit, not Freightliner. Freightliner mechanics focus on Freightliner trucks. Detroit mechanics specialize in Detroit engines, take it to them, let them update the software and check the turbo, and check the air-to-air. Pressure test for leaks.

  5. #5
    Bobtail Member
    Member Since
    Aug 2009
    Location
    oklahoma
    Trucker?
    No Answer
    Posts
    3
    Thanks
    0
    Thanked: 0 Times
    Yes is shows to be fine on a leak down test. I have went over all the common stuff on it that I am use to doing on Detroit's (filters,leak down,boost).

    This is the first egr engine I have dealt with and just not sure where to go. It shows to be getting 6.5 on the comp but the real numbers only show around 4.1-4.3.

    I don't have the time but I may have to take a few runs in the truck to see how it actually runs. The only seat time I have in it is from bob tailing home from the dealership.

  6. #6
    Light Load Member
    Member Since
    Aug 2009
    Location
    Portland, Or
    Trucker?
    7 Years
    Posts
    183
    Thanks
    46
    Thanked: 49 Times
    Is somebody stealing your fuel outta the tank? It happens. That or you might have a diesel leak.

  7. #7
    Bobtail Member
    Member Since
    Aug 2009
    Location
    oklahoma
    Trucker?
    No Answer
    Posts
    3
    Thanks
    0
    Thanked: 0 Times
    Its possible, but have no evidence to say its leaking or bein stolen.

    I will see about getting it into detroit in the morning to have them look it over.



    Thanks for the help.

  8. #8
    Medium Load Member
    Member Since
    Jan 2009
    Location
    Verona Wi
    Trucker?
    26 Years
    Posts
    401
    Thanks
    33
    Thanked: 128 Times
    Had a friend spend alot of money and time chasing same problem with an MBE. turned out truck was fine, odometer was running way short. changed tire size when he bought the truck and odometer had not been programmed right.

  9. The Following 2 Users Say Thank You to PaulE For This Useful Post:


  10. #9
    Road Train Member 550hpW900L's Avatar
    Member Since
    Jan 2008
    Location
    norcal
    Trucker?
    WannaBe
    Posts
    1,872
    Thanks
    370
    Thanked: 1,090 Times
    Sounds like your driver is selling fuel.

  11. The Following User Says Thank You to 550hpW900L For This Useful Post:


  12. #10
    Road Train Member stranger's Avatar
    Member Since
    Oct 2006
    Location
    NC
    Trucker?
    34 Years
    Posts
    3,231
    Thanks
    982
    Thanked: 4,021 Times
    Quote Originally Posted by 550hpW900L View Post
    Sounds like your driver is selling fuel.
    Was going to say that myself. I've had drivers sell some of mine before.

    According to Detroit specs, a 3.36 rear would be better for fuel mileage since you have a .78 OD and LP 22.5s

  13. The Following User Says Thank You to stranger For This Useful Post:


Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •