In Reply to: Re: Re: Re: Re: 8780xp fuel problems posted by dav11 on October 22, 2008 at 19:15:35:

Where and what is the accumulator?

Cummins referred me to CaseIH for parts. My mechanic was from a local truck service place. He has worked on quite a few of these and remarked the setup in my combine is similar to what the Dodge pickup with the Cummins engines has. Fuel pressure is very important with this system. Any drop in fuel pressure starves the injection pump and scores it. Then you are done and the only option is to replace the injection pump. He replaces the supply pump whenever he replaces an injection pump. The mechanic suggested replacing the electric pump every so often to save that expensive injection pump. He said there was a fuel pressure warning light available from Cummins. I will check into that. Also I have vowed to change fuel filters more often and check that filter for water periodically no matter what a pain it is to get to. I have put better filters on my supply tanks and will check them for water more often as well.

It certainly runs with much more power but I notice the digital tach bounces about 30 rpm. Hope that's not a bad thing.

Does anyone know when they started with this electronically controlled injection pump?