2.5 na in a series III questions

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  • green 'n stinky
    Low Range
    • Nov 2007
    • 28

    2.5 na in a series III questions

    Hello all. I'm in the process of trying to replace my 2.25 diesel with a 2.5 na diesel. Since my truck was already a diesel, all the right fuel plumbing is there, but I can't figure out how to hook it up. Specifically, I don't know how the plumbing works between the fuel filter, the lift pump and the injection pump. Does anyone have a good diagram of the 2.5's DPS injection pump connections, or know where I can find one? Also, I swapped my thermostat housing from the 2.25 to the 2.5, but do I use the 2.25's thermostat?
    Thanks in advance.
  • junkyddog11
    1st Gear
    • Feb 2007
    • 195

    #2
    use the thermostat that fits, which will be ...errr I think the 2.25's.

    the fuel line goes; tank - lift pump - fuel filter - injection pump (injection pump also has return to filter, the connection near the solenoid) - injectors - spill rail - back to filter - return to tank.
    Matt Browne
    www.overlandengineering.com
    "resurecting junk through engineering"

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    • green 'n stinky
      Low Range
      • Nov 2007
      • 28

      #3
      Thanks for the reply. I thought the connection on the pump closest to the solenoid was the inlet, rather than the return. I'm glad I asked!

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