Cummins C Series Engines produced from 1991 through 1997 were supplied to the RV Industry and the Medium Duty Truck Market (Freightliner Business Class) and Emergency Services Chassis / Platforms (Fire Trucks, etc.). Generally regarded as robust, durable, and reliable, they have had problems with Fuel Shut off Solenoids failing which would not allow the engine to start or shut off as required. While the lever can be manually over-ridden, access is typically difficult in a motor home and seems to be most often required at 10 PM in a driving rain
Cummins issued Service Parts Topics (SPT) to cover this subject;
- SPT00T5-9 Horizontal Fuel Shutdown Solenoid Assembly (note the SPT lists the Engine Family as B but it is applicable to the C-Series.)
- SPT99T5-7A Fuel Shutdown Solenoid TS & R
- SPT99T5-27 Vertical Fuel Shutdown Solenoid Kits
These SPT's are applicable to engines equipped with the Bosch P7100 pump and the RQVK Governor. The part numbers in the SPT's are valid. The SPT's are (hopefully)
attached or can be accessed via Cummins Quickserve.
Our Fuel Solenoid finally failed after 17 years of mediocre life. We installed the horizontal assembly and have noticed a significant improvement in performance and fuel mileage - apparently the old solenoid was not holding the fuel shutdown valve fully open.