5.9 Cummins Engine Injector Pump Problems

Written by amy rodriguez | 13/05/2017
5.9 Cummins Engine Injector Pump Problems
A car engine contains an intricate fuel system that includes an injector pump. (Jupiterimages/Pixland/Getty Images)

Diesel fuel powers a 5.9-L Cummins engine through the use of a fuel injector pump. Many vehicle malfunctions are symptoms of a bad pump, which can cause poor engine performance.


The 5.9-L Cummins engine was used in full-size Dodge trucks starting in 1984. Initially, the injector pumps installed in the Cummins engine were mechanical. These mechanical pumps were later replaced by computer-controlled pumps, which offered more efficient fuel consumption and higher power output.


A problematic injector pump may affect the vehicle's idling, power performance and ignition features. Blockage due to fuel contamination is a common cause of a failed injector pump. The pump cannot move fuel through its assembly if the fuel contains a significant volume of debris.


Many fuel-system part failures mimic the problems encountered with a faulty injector pump. Before replacing an injector pump, check for a clogged fuel filter and verify that air has not infiltrated the fuel lines.

By using the eHow.co.uk site, you consent to the use of cookies. For more information, please see our Cookie policy.