CM2250/CM2350 Fuel Pump

[Unilevers]

the reason the 3 piston was on there is because cummins was making a ISX16 and needed the fuel. The 3 piston pump is off some of their bigger common rail engines. Then cummins decided to not do the ISX16 and went only with the 15, They pulled a plunger/barrel and tappet assemble out of the pump and pushed em out as ISX15. Ever wonder why there are 152mm Blocks? They machined them for the ISX16 and decided against it and just made different liners to not ruin all those blocks.

3 piston pumps fail much much more than the 2 piston. The updated Tappets have DLC (diamond coating) on the roller and tappet. That is the update.

Uni