ISX 15 CM 871 Crank but wont fire

I have an ISX 15 CM871, last week the starter went out. Had it replaced, while the dealer had it they called me and said it would crank but not start after they replaced the starter. Before the starter went out, it would fire up easy. So they did a diag, cleaned sensors etc. Ticket shows from insite engine state not changing from stopped to cranking. They sprayed ether in, fired. Insite shows engine state changed and synchronization. Said I was good to go.

So the next morning, the truck would turn over, but not fire. I tried priming 4 times, still nothing. Hit it with a small shot of ether, fired up. About an hour into the drive, got fuel shut truck off. Fired right back up. Went on about the day. The next morning same thing, no fire without a small shot.

So now the only way this truck will fire after sitting over night (or more than 4 hours or so) is a small shot of ether.

The lift pump comes on and I can hear it. Have fuel squirting out of the port on top of the gear fuel pump, but still no fire after sitting without a shot.

Any Ideas? Bad gear pump? Check Valve?

 

Okay, thank you for responding. What symptoms does this usually give? Once truck fires with a small shot in the AM runs fine all day and will restart if done within an hour or two of shutdown.

 

Has he found the issue or a fix? Pretty much my issue. Once it fires 1st thing in the am, runs grear all day and can be shut down and restarted within an hour or two.

 

Okay thank you!

 

Okay, ill try that. After the 1st fire with a shot im the am, truck will run fine and can get shut off and fired back up no issues within a few hours?

Only need ether after sitting a few hours? Could the sensor still be the issue?