what is this sound

Discussion in 'Freightliner Forum' started by shatteredsquare, Nov 29, 2020.

  1. shatteredsquare

    shatteredsquare Heavy Load Member

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    coming from behind the fuel filters

     
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  3. MACK E-6

    MACK E-6 Moderator Staff Member

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    I assume you’re referring to the noise that’s occuring roughly every 2 seconds?
     
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  4. shatteredsquare

    shatteredsquare Heavy Load Member

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    yeah that pulsing click sound, it's linked to RPMs, higher RPMs and it picks up the cadence. pretty sure something fuel system related, it's coming from the Bosch thing behind fuel filters. no fuel issues at all, MPG fine, timing fine, power fine. just a whole lot of clicking...
     
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  5. 86scotty

    86scotty Road Train Member

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    I've heard that before on occasion. I don't think it's a problem. Maybe it's the DEF system pulsing fluid?
     
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  6. D.Tibbitt

    D.Tibbitt Road Train Member

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    This must be a detroit. I had a freightliner with detroit that did this non stop..
     
  7. MACK E-6

    MACK E-6 Moderator Staff Member

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    I think he said in another thread it’s a DD13.
     
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  8. shatteredsquare

    shatteredsquare Heavy Load Member

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  9. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    O.K. Now we are getting somewhere! What you have is an injector(s) that have a cracked seat face. Where the injector meets the injector cup face there is a copper washer. Under the washer the injector nozzle seat has a crack. I have dealt with this "chirping" many times. Detroit solution is to replace all 6 injectors since it will probably eventually happen to all of them anyway. Mucho $$, so you can pull and inspect, sometimes magnifying class is needed, and replace only defective ones. Good news is Bosch identified problem a while ago and new injectors don't have this problem.
     
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  10. Oscar the KW

    Oscar the KW No Filter

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    My 2016 and 2018 have both made this sound since new.
     
  11. Oscar the KW

    Oscar the KW No Filter

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    This is the sound I think you are referring to, and would make since. A cracked face on an injector will put air back into the fuel system. The sound I hear in the op’s post is the fuel quantity control valve doing its thing.
     
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