- 8.3 cummins engine serial number location upgrade#
- 8.3 cummins engine serial number location series#
After few miles, engine started cutting out. Had a problem last fall in my motorhome on parkway at 65mph. Might my problem be caused by the same issues?
The lift pumps on these engines only run for a minute or so at start up, then they go into bypass and a gear pump on the injection pump sucks the fuel needed.
Leads me to think that not only do you need to consider the lift pump, but also the injector pump on the ISC and ISL engines built from 1998 to 2003 and the 2003 ISB engine. Although he replaced the fuel supply and return lines and that appears to have solved the problem. Has anyone run into this and if so that would explain the low power issues posted by Chuck in his thread No acceleration from dead stop and it might also cause the ISL and ISC engines with the CAPS fuel injector system to shut down after a few seconds posted by jleamont. Gear Pump 10 psi Cranking 10 psi Cranking The excess fuel is used to cool the circuits and then returned to the fuel tank. Low Fuel flow / Pressure can damage the internal electronics. Internal seal-diaphragm can fail and fuel will pass into the oil, making oil! Not good! To be sure that was the problem, moved the injector to different cylinders to see if the problem followed and it did, but the injector pump proved to be defective also! A relatively new injector pump about 6 months old and exchanged under warranty. Replacing the injectors will not solve a bad injector pump problem.Īs the engine warmed up the O-ring on the injector expanded out of spec. A bad one can damage the injector pump, and if you change the injector pump with out replacing the suppressor will void the warranty.
8.3 cummins engine serial number location upgrade#
The second is if the upgrade was done, have the tech properly splice (re-solder) the connection and use the correct method to seal the splice.Īlso, check the Transient Suppressor. The solution is twofold, one is to clean and inspect every connector (including the big one near the lift pump) and degrease/grease them with the right dielectric grease made for Packard connectors (a lot of techs fail to get that part). Some time ago Cummins issued a service bulletin to change the wiring from the old connector and lead that goes to the fuel pressure sensor to a new connector and lead - an upgrade kit was issued for this which included a new connector, three crimp connectors and an instruction sheet.Ī lot of time the connectors which are supposed to be sealed upon crimping, fail and the ECM sees the fuel pressure vary during idle hence rough idle and sometimes no starts.
8.3 cummins engine serial number location series#
This CAPS pump was a computer controlled injection pump, with individual fuel lines to each injector.Ĭummins Accumulator Pump System (CAPS) fuel injection pump for Cummins 6 cylinder C series engines where used in heavy duty on-road, agricultural applications and many Motor-home applications.Ĭummins ISC 8.3 300 Hp Warm engine rough Idle The original ISC engine featured a Cummins Accumulator Pump System (CAPS). Beginning in 1998, Cummins introduced the ISC based off the earlier mechanical 8.3 C-series engine.
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