2012 prostar with maxxforce 13 losing power

Discussion in 'International Forum' started by Eddozer, Dec 17, 2019.

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  1. Eddozer

    Eddozer Bobtail Member

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    The truck will not go over 55 mph in 9 speed, when pulling a load and it takes a long time to get to that speed, in a ssmall hill it will go down to 25 to 35 mph and 6 to 7th gear, the mechanic said that the computer shows fuel restriction problem and he said that its a fuel pressure regulator valve, but he could not find the location of it?, any thoughts?. any one has a picture of the location. I can not afford to take it to the dealer, the mechanic said the valve itself is $500. all the dashboard gages look normal and have no alarms.
     
    Eddozer, Dec 17, 2019
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  2. Eddiec

    Eddiec Road Train Member

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    Check your fuel lines and replace - they may have collapsed
    Check condition of the fuel that you're using. Make sure that it is clean and is at the right cetane value
    Check your air filter - clean or replace
    These are cheap
     
    Eddiec, Dec 18, 2019
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    Rngls Thanks this.
  3. Heavyd

    Heavyd Road Train Member

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    The computer will not show a fuel restriction problem. It will show low fuel pressure only. With a Maxxforce you have the low pressure supply system and high pressure injection, so it depends on what he says is low. Low pressure fuel delivery regulator is part of the high pressure fuel pump and not replaceable. The high pressure fuel control valve is serviceable.
     
    Heavyd, Dec 18, 2019
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    Rngls, Eddozer and QUALITYTRUCK Thank this.
  4. Eddozer

    Eddozer Bobtail Member

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    Would you happen to have a picture of the High-Pressure Control Valve so I can purchase it and have it replace, I believe you are right and that is the problem, since the "mechanic" Lol said it was high pressure.
     
    Eddozer, Dec 20, 2019
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  5. Eddozer

    Eddozer Bobtail Member

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    upload_2019-12-19_22-47-55.png

    Would that be the High pressure valve??
     
    Eddozer, Dec 20, 2019
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  6. Heavyd

    Heavyd Road Train Member

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    Nope, that controls the fuel pressure to the doser injector. High pressure control valve is on the back of the high pressure fuel pump. The part with the two main fuel lines at the left front corner of the engine sorta tucked in behind the ecm.
     
    Heavyd, Dec 20, 2019
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    Eddozer Thanks this.
  7. Eddozer

    Eddozer Bobtail Member

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    upload_2019-12-21_13-1-24.png

    How about this one?. Sorry to bother you.
     
    Eddozer, Dec 21, 2019
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    cordiealonso Thanks this.
  8. Heavyd

    Heavyd Road Train Member

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    Bingo!
     
    Heavyd, Dec 22, 2019
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    Eddozer Thanks this.
  9. Eddozer

    Eddozer Bobtail Member

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    :) Thank You.
     
    Eddozer, Dec 22, 2019
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  10. Eddozer

    Eddozer Bobtail Member

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    My truck is running good again, I worked on replacing the fuel sensor above and once I had the whole thing apart I found the real problem.. If anyone care to see the repair video here:
    is a little long about 14 minutes but you can see what the problem was at the 10 minutes mark on the video
     
    Eddozer, Jan 15, 2020
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    Lechugadiesel, Rngls, Heavyd and 1 other person Thank this.
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