Cummins isx

[JimT]

(07-03-2021 )Bandit2122 Wrote:  515k miles oil temp 225 no oil consumption between oil changes..every 20k miles. No coolant use. The smoke out oil cap is barely any there

OK. So, investigate the fuel pump ASAP. It's the most likely cause and could destroy the entire engine if it failed.

IF the fuel pump/pump head is still good then there are a couple other possible causes of that code, but at that mileage the original pump head is already past it's usual failure point.

I did have that code pop up once when my DAVCO unit was getting air because the top o-ring was not installed, but you would easily notice that there is no fuel in the DAVCO and once it ran dry it wouldn't restart without adding fuel. Likewise, any air intrusion between the DAVCO and the fuel pump could cause a stall. But again, the pump head is known to eat itself some time over the 400,000 mi mark so it's the number one suspect right now.