× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: School Bus Lacks Power - OLD DIESEL HELP
Posted to HD/Fleet Forum on 7/3/2019

Hello, If it is the 6.9, sounds like the injection pump is going bad. On top of the pump where the return line goes on take out the fitting. there is a clear check ball inside. Inside the injection pump there is a fiber washer that starts going bad and clogs t... Login to read more.