ISX 15 CM 871 Crank but wont fire After new Starter

[Livingston Trucking]

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?

To me its odd this wasn't an issue until they replaced the starter. Not sure what to do guys.

Any help will be much appreciated.