Truck Won't Stay Running, Long Cranking with Multiple Attempts

[TexNeck]

Ok so here we go.

Did the test, yes once unplug it did sound like a 12V, but not quite as rattly as I was expecting.

Pressures went from 5047 at idle then spiked to 29556 once unplugged.

I did tap on the FCA a little bit, the idle pressures seem a little bit hight now just over 5k more consistent.

So now what.

So now we need have eliminated a bad CP3, FCA, and pressure relief valve.

My next thought goes to the code coming up about intermittent loss of connection with ECM.

You said batteries are good/load tested. Have you checked your chassis ground connections and fuses?

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[Junior48]

Nope have not done that yet.

Guess I'll start scrubbing tomorrow.

Hope I can find something...

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