CM871 Not Starting

[Rick808]

(08-08-2021 )Rawze Wrote:  You could guess at it for a month and not figure it out unless you narrow it down properly thru proper troubleshooting methods ...

It could be something fuel related (usually is), but also could be a wiring or power issue ... or even a bad ecm.

How much fuel pressure PSI does the engine show in Insite while cranking?. That is the first place to start, as it will verify that the ECM is reading the correct pressures, the fuel system has the right pressures, and at least its trying to start the engine.

here are some similar threads...

http://rawze.com/forums/showthread.php?t...3#pid11413

Finally located the problem. We tested injectors and everything ended throwing a code for low fuel pressure. We started looking at the fuel pump noticed a bolt fell out and caused a leak.

This was causing it to loose prime and when it throws the low fuel pressure code it shuts off the priming pump.

We pulled the pump replaced the gasket, put a new bolt in fires up no issues and holds prime as it should