A high pressure fuel pump pressurizes diesel fuel to extremely high pressures. Emissions standards have requierd higher and higher pressures, and new technologies have met the demands. As the pumps get older, they can become problematic. The solenoids can fail And the many seals can start to leak. Leaks are probably the most common problem. Sometimes, they just wear And stop building really high pressures.
Two of the pumps that Cummins used were the CP4 And CP3 pumps from Bosch. The CP4 pumps are newer, but cause more problems. Cummins actually recalled some of their CP4 pumps. The CP3 pumps are considered by most to be bulletproof, And a lot of people will convert engines from a CP4 pump to a CP3 pump.
Cummins also developed their own technology, but they mostly used Bosch high pressure fuel pumps.
Here are the hpfps:
  Rebuilt 03L130755 High Pressure Fuel Pump   0445010853 BMW HPFP   Rebuilt 0445020030 Chevy HPFP   Rebuilt 0445020109 Bosch CP3 HPFP   Rebuilt 0445020122 / 0445020043 Cummins HPFP   Rebuilt 0445020176 Bosch CP3 Cummins HPFP   Rebuilt 0445020238 CPN5 HPFP   Rebuilt 0445020609 CP4N2 HPFP   Used 5291204 HPFP Gear   Set of 8 0445117024 Rebuilt Ford 6.7 Injectors and Rebuilt Ford 0445010622 Pump   Upgraded Rebuilt 0445010834 High Pressure Fuel Pump
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