Problem 2003 Newmar 38" 8.1

[Henderman]

The Engine Runs Great for 300-400 miles then starts to miss under load. Park it and let it cool it is fine for another 300-400 miles .
Has anyone else had this problem?

 

[Webz]

Is the engine showing any codes?

 

[Rich W.]

Without any other info I’d say it sounds like a fuel filter or fuel related problem.

 

[Swipular]

I had a similar problem. Turned out to be the high pressure fuel pump going out.

 

[Henderman]

Is the engine showing any codes?

No it is not

 

[Henderman]

I had a similar problem. Turned out to be the high pressure fuel pump going out.

I have replaced the fuel pump