Tweet
This motor home had a dash code SPN 157 which is a Cummins code 559 Injector Metering Rail 1 Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level. Basically what has happened is that the engines computer expects to see a certain amount of fuel rail pressure and doesnt. This indicates a fuel leak on the high pressure fuel system some where. Enjoy the video and please like and subscribe to my youtube channel. I also made a diagram of how the fuel system on the engines operate. I apologize for my lack of artist skill.
