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  1. sed6

    Basic Mods For The M939 Series With The NHC 250 Engine...

    Thanks. Can I shim it myself? I have my pump off right now after a rebuild at the pump shop. They had already completed their bench test before I mentioned the shims and button. They did though say the pump was running strong. I'm anxious to get the truck running again and might want to tackle...
  2. sed6

    Basic Mods For The M939 Series With The NHC 250 Engine...

    Did some reading. I'm wrong. The button impacts pressure going to the rail. Just as stated above.
  3. sed6

    Basic Mods For The M939 Series With The NHC 250 Engine...

    I thought putting a smaller button in actually restricted the return of fuel to the pump and built up fuel rail pressure. Whereas turning out the screw is what allows more fuel from the pump to the engine. Do I have that wrong?
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