Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Do you have the serial number for the engine?
That code is a low fuel pressure warning do you want the troubleshooting guide for that issue
Here is troubleshooting for that code
Do you know what the fuel system pressure is?
Do you know what the oil pressure is and does it fall off when this happens?
Let me opt out see if someone else has an idea on this.
Hi my name is***** will be glad to help. If you are dropping pressure under a load and there are no leaks of restrictions your problem is either a faulty pressure regulator or fuel transfer pump. Its common for either of these to cause low fuel pressure. Let me know
Thanks for the update. Tee into the fuel rail with regulated shop air and check for leaks at the injectors or injector o rings allowing fuel to bypass. if all external fuel system components have already been checked and verified okay. Let me know
You will likely find a mechanically faulty injector or an injector o ring problem. Look for worn injector cups if the injectors are removed for reseal and be sure to clean the cups well and inspect.
Pleasure to help Don. Let me know