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What are the symptoms........

Discussion in 'Trucks and Trailers' started by KenH, Feb 25, 2005.

  1. KenH

    KenH LawnSite Bronze Member
    from CT
    Messages: 1,622

    of water in Diesel fuel. I am new to the diesel scene and have a 2003 (7000 miles) Mits. 640. Been running very sluggish latey, ie. press pedal and feels like truck is overloaded to twice its capacity, and stalls out every once in a while when realeasing pedal. I have a service appt next week, but was just wondering if I could get a heads up on what it could be.
  2. Mowman29

    Mowman29 LawnSite Member
    from OH
    Messages: 106

    you might want to post this question on Plow Site but I believe it is water in the fuel. not cheap. it could be a fuel pump also. or bad sending unit. my advice don't drive it get it to the shop ASAP. You might end up with no motor at all.
  3. KenH

    KenH LawnSite Bronze Member
    from CT
    Messages: 1,622

    Thanks. There is actually a water/fuel separator which I drained and reprimed, and also a light which is supposed to indicate water in the fuel which has not lit. So Im not sure what it is.....the appt is on Wednesday. I just have to make it about 35 minutes away......
  4. jsr2741

    jsr2741 LawnSite Senior Member
    Messages: 392

    Try changing the fuel filter, if this fixes it you saved yourself some money. If not at least you've eliminated two possible causes.
  5. pottstim

    pottstim LawnSite Senior Member
    Messages: 501

    Yes, change your fuel filters often. We do it every oil change (6,000 miles) on our 2004 Isuzu NPR at work, and have had no problems in 16,000 miles. Like someone said above, keep an eye on your water seperator. On the Isuzu, the seperator is located behind the cab along the frame on the driver's side. I'm not sure about the Mitsu trucks though. Our truck has a float in the water seperator, and I've only had to purge it twice since we bought it in Dec 2003.At the time, it only had 3/4" of water in it. I try to buy fuel only at places where they sell a lot of diesel, so it doesn't have time to sit in those underground tanks and build up condensation. Best of luck in solving your problems.
  6. KenH

    KenH LawnSite Bronze Member
    from CT
    Messages: 1,622

    Thanks guys. Ill let you know what they find out on Wed...........
  7. KenH

    KenH LawnSite Bronze Member
    from CT
    Messages: 1,622

    Just an update....I changed out the fuel filter today, bled the system, and problem fixed.

    Thanks for the help.

    Im still taking it in though for the yearly preventative service.

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