Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Thanks for asking your question. I will try and help you out.
Has the fuel pressure been checked on the engine while driving?
Has the engine always done this? Or did it start recently?
Thanks for the information. There are two things I have seen cause this.
I would check the fuel pressure first. Your engine should maintain a fuel pressure between 65 and 85 psi. There is a plug beside of the secondary fuel filter that is used to check the pressure. If it is low, I would first try the fuel filters if you haven’t already. If it is still low, you may have a failed fuel pressure regulator, which is located on the back of the cylinder head. I have replaced a ton of these for low fuel pressure. It is kinda a known problem. You could also have a weak fuel transfer pump or restricted hand primer pump, if your engine has one.
If the fuel pressure is in specs. I must next suspect the injectors. Over time the can wear and begin to cause this problem.
Please reply back if you need more help or have more questions. I am happy to assist.
I see. Thanks for the information. I would definetely check the fuel pressure. Since there is no engine light coming on, it sounds like a fuel pressure issue.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.
Ok sounds good. Let me know how you make out.