Yes you can change the rpms up or down and or change the fuel pressure. It's a pretty simple procedure. The back of the pump, on the bottom has a barrel held on by four 1/4" bolts, there is whats called a shim pack inside of this barrel, by adding or removing shims you will raise or lower the engines rpms. I am sorry I can't remember which lowers rpms, adding or removing shims. I would go to cummins and get a couple of extra gaskets and shims and experiment. Also inside is what is commonly referred to as the fuel button, it will have a number on it designating its size. It could be anywhere from a .00 to a 50 or I'm not even sure how high they go, but the lower the number the more fuel pressure you will have. Fuel pressure is power; rpms is speed. Don't mess with the fuel pressure. I am going off the top of my head with this information. If you want more detailed information let me know and tomorrow I will go out in the shop and take an old pump apart and come back with a few more details.
Last edited by moe; 01-14-2012 at 01:16 AM.
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