A diesel injector pump pressurizes diesel fuel to extremely high pressures and meters it to the cylinders in the correct time. As the pumps get older, they can become problematic. The start/stop solenoids can fail. When they do, the pump either won't turn on or won't turn off. The most common problem Is leaks. What most people think of when they hear the word leak is diesel leaking out, but I think air leaking in is a bigger problem. It's like a silent killer. You don't know that you have a problem, untill the pump loses prime and won't start. The seals get old and crack Or just stop working. Sometimes, they just wear And stop building the high pressures needed to pop the injectors.
Two of the pumps that Cummins used were the Bosch VE pump And the Bosch Inline pump. The inline, p-pumps, are considered by most to be bulletproof, and a lot of people will convert engines from a rotary pump to a inline pump.
Cummins also developed their own technology many years ago, but they mostly used Bosch injection pumps.
The last rotary pump Bosch used on Cummins engines was the VP44 pump. Here are the pumps:
  Rebuilt 03L130755 High Pressure Fuel Pump   0445010853 BMW HPFP   Rebuilt 0445020011 Bosch CP3 HPFP   Rebuilt 0445020015 Cummins HPFP   Rebuilt 0445020030 Chevy HPFP   Rebuilt 0445020109 Bosch CP3 HPFP   Rebuilt 0445020122 / 0445020043 Cummins HPFP   Rebuilt 0445020146 CP3 HPFP   Rebuilt 0445020176 Bosch CP3 Cummins HPFP   Rebuilt 0445020238 CPN5 HPFP   Rebuilt 0445020609 CP4N2 HPFP   Rebuilt 0460424024 4B Bosch VE Pump with Long Delivery Valves
  Rebuilt Cummins 4BT Pump with Long Delivery Valves and Timing Solenoid   Rebuilt 0460424261 Cummins 4B Pump with Long Delivery Valves and Timing Solenoid   0460426167 Rebuilt Cummins 6B Injector Pump   0460426366 Rebuilt Cummins 6BT Injector Pump   1468336480 Injector Pump Rotor for Cummins 6BT   3903380 Copper Seal   3906698 Water Pump Gasket   3911331 Injector Pump Gear   3916910 Rebuilt Cummins 6BT Injector Pump   3930337 Oil Pump   3931382 P-Pump Gear   Used 3955153 HPFP Gear   3960342 Water Pump   3960623 Gear Housing   3960783 and 3960784 6BT Injector Lines   5267784 Gear Housing   Used 5291204 HPFP Gear   Rebuilt 4BT/4B 8v engine with Pump and Injectors   New Extended Longblock for Cummins 4BT 8v for P-Pumps   New Extended Longblock for Cummins 6BT 12v for P-Pump   Used Ford 6.4 HPFP Sprocket   4931029 4929779 Injector Lines   Upgraded Rebuilt 0445010834 High Pressure Fuel Pump   VE Pump Repair Kit with Large Triangular Gasket   Timing Gauge for Bosch VE Pumps
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