99 freightliner problems

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by City-Boy, Feb 18, 2025.

  1. City-Boy

    City-Boy Light Load Member

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    I promised an update So that problem kicked in again last night I was loaded grossed at 80 the popping and smoking got real bad north of Effingham and eventually I was only able to get her up to about 45 mph smoking and chugging like crazy. Clean and check every sensor and plug I could find didn't do anything so I parked. I was unable to drive today as it was doing it in even low gear. I checked every opening to the turbo and even removed the valve cover as there was oil seepage from the rear of it. Everything looked fine. Went to a shop for a service and they found metal flakes in the bottom of the filter closest to the cab and even more and some oil in the on connected to the fuel pump. No odd or disrupted idle even he said it sounded smooth. With fresh filters I test drove it and it ran like it should no smoke no popping and feels powerful. So obviously there's a problem starting with the fuel pump then observe filters for contaminants. Thought I'd update and see if anyone has thoughts on this
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    I think you had some dirty filters is all. I really don't think you have any issues with the fuel pump.

    If I had a shop tell me I had metal flakes in a fuel filter on a 60 series engine and it was caused by the pump, I'd change shops before I changed the pump.
     
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  4. City-Boy

    City-Boy Light Load Member

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    Lol agreed I've been through to many sketchy shops!! I did see them with my own eyes and yeah I shook me a little!! Ive never actually poured out a filter and explored its contents so It bothered me thinking on know my truck is going to blow up after rebuilding the #### thing last march!! So I'm going to keep a closer eye on it and maybe inspect my filters more thoroughly.
     
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  5. City-Boy

    City-Boy Light Load Member

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    Just curious because I'm not to educated in this type of stuff and I try to learn all I can. Is shavings in the fuel filters a normal thing? Or is seeing them myself a reason to proactive and this.
     
  6. Rideandrepair

    Rideandrepair Road Train Member

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    Not normal. Were shavings in primary between tanks and fuel pump, or secondary between fuel pump and head? Anything from the tank should get caught in the primary. Especially shavings you can see. If in secondary, maybe they are coming from the fuel pump. Sure it’s metal? Old fuel lines sometimes swell and deteriorate inside. Sometimes get small chunks of rubber in primary filter.
     
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  7. xsetra

    xsetra Road Train Member

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    Drive the truck a couple thousand miles and change the filter. Cut open the current filter and look again
    to see what is embedded in the filter, not just what pours out. Because whatever pours out could have been poured in.
    Good luck.
     
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  8. City-Boy

    City-Boy Light Load Member

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    It was in the filter under the fuel pump didn't notice really anything in the second one. Definitely a possibility to have been poured in to filter but idk he didn't try to get work out of me. He suggested changing pump ad flushing system but wasn't trying to talk me into it or schedule anything so I'll monitor filter and act as needed. Day two and she seems to still be running hard and idle still smooth soooo we'll see
     
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  9. City-Boy

    City-Boy Light Load Member

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    Just a question on replacing my fuel pump. Should I stay with detroit parts or is aftermarket safe to use on something so important
     
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  10. xsetra

    xsetra Road Train Member

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    If you don't use OEM buy a good quality brand. NOT a cheap import.
    When I was buying parts for my FLD. Freightliner dealer was very competitive with prices.
    Not sure about my Cascadia DD15 parts. Haven't needed much yet.
     
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  11. Rideandrepair

    Rideandrepair Road Train Member

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    I don’t know what brand OEM is. I think I got mine at Freightliner along with my compressor. They had the best price on compressor. I want to say the fuel pump was about $150. It’s not too expensive. Common pump used for many different applications. I’ve been told they run forever even when pumping real dirty water full of debris. Mine did weep at gaskets for about a week, before sealing up. The test procedure in Detroit manual, is to stick a wire into the weep hole on the bottom, crank Truck, if you feel the wire vibrating, fuel pumps bad.
     
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