09 prostar with ISX randomly shutting down

[in2trux]

(02-07-2017 )09pornstar Wrote:  

(02-07-2017 )gearhead Wrote:  When the engine won't start i would go and check main ecm power when it won't start. It may have thermal fuse that when.

I already checked that and its a regular red fuse(dont know for sure the amps) and it looks new, not melted or burnt. I mean could the fuel shut off valve get hot somehow? That thing is electronic controlled right? Cause after the engine stops it wont fire up for 5-7 mins, its like something got hot and it cools down..

Like Gearhead said, look for a thermal breaker near the ecm. Not the spade type fuse. They can be silver or black metal cover and can also be in the fuse block.
Those are the exact symptoms. It takes about 5 minutes for them to cool down and reset. It may be weak and a simple replacement. They can overheat from high ohms or voltage
Like everything , they do fatigue with age.
You might check voltage to fuel cut off solenoid, center of IFSM, between the actuators.
A weak solenoid could act the same.