Howdy Folks,

I have been experiencing some issues with my fuel pump relay located beyond the air filter and turbo. Upon replacing / relocating the PMD prior issues were resolved. About a week after that she would not start right up in the morning, it took about 10 minutes of cranking -- no partially combusted fuel just the alternator cranking. Finally I got her to turn over but the motor sounded much higher pitched, louder, and 'mechanically rough' and of course a check engine light (I need to check the codes) I did some digging on the issue and found the fuel pump relay may be the culprit. Sure enough I swapped this bad boy out and no more issues.

However... This morning I felt a very slight jerk and the check engine light came on so I pulled over, turner her off and went to crank and same issue with delayed cranking... I unplugged the relay waited a few minutes turned her over and still same issue. After getting home I turned her off and back on and no issues!

I believe I must have some sort of electrical issue within the injection system -- does anybody have any input on why the fuel pump relay will go bad, continuously?

Thanks guys

 

Whacky.

Are the glow plugs coming on? Dash lights acting weird? Any random shutoffs?

 

The glow plugs seem to be fine. I had intermittent random shut offs before I replaced / relocated the PMD but no issues with that since.

I have not any issues since my last post (knock on wood).. I am just looking to track down what is down line from the relay

Thanks for the response

 

99-02 24v Cummins don't have glow plugs rather they have a grid heater but check the connection to the grid heater.

As for 94-98 12v Cummins I don't know much about those.