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Isuzu fuel filter

Discussion in 'Trucks and Trailers' started by mmacsek, Jan 29, 2010.

  1. mmacsek

    mmacsek LawnSite Senior Member
    Posts: 543

    I purchased a used 1999 Isuzu NPR this past fall and this is my first diesel so I have some basic questions. When you change the fuel filter do you have to bleed the fuel system? I got air in the system when I drained the water from the separator last fall and it wasn't running. That was apain. thanks Matt
  2. meador56

    meador56 LawnSite Member
    Posts: 90

    Yes we change filters when the motor is warm prime {fill} the new one and when you start the engine rev it 15-1800 rpms it will stumble but should clean up and run. As for starting an unprimed fuel system we cheat and it works but I can't reccomend it for the inexperienced.
  3. lawn king

    lawn king LawnSite Silver Member
    Posts: 2,279

    If you follow the above post, you dont have to prime the system.

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