Dd15 no start without starting fluid

Perhaps a suction side air leak in the fuel lines from the tanks to the fuel pump. If may be a large enough leak that the hand pump cannot over come it, but small enough that once it is running the main pump has enough suction to overwhelm the leak.
If your truck has the fuel shutoff valves, I had a seal leak on one of the valve stems due to the weight of the hand control rods that go to the actual valve pounded out the stem from the side loading on it.

 

Does it have a davco?
If so,fill it up and see if it drains in about 10-15min.
Did this start after a filter change?

 

Sounds like a bad Davco check valve. If so they are about thirty bucks and can be changed in about ten minutes.

See if the filter is empty after ten hours of sitting. It shouldn't be.

 

Have to have software to get the data for something like this. Key on engine off, what are the sensors reading, injectors..... What is everything reading while cranking and the truck does not start. What changes when ether is used and the truck starts? Not all problems set a code, even electronic ones. It may be that it only happens after the truck sits for 10 hrs because it cools off. I would also take the connectors apart at the sensors such as the crank and cam sensors and look for corrosion. Other than that get the software version on the ECM checked and may have to have the ECM flashed for updates and the most current version. And always check for service bulletins.

 

I'm still thinking it sounds like a fuel pressure leak.

There is a pressure relief valve on the end of the fuel rail. Those go bad sometimes. I don't remember what they cost but it isn't much. It's also possible an injector could be leaking. You would catch that with an oil analysis. There is a check valve in the fuel filter module also.

Did you say you have the DDDL software? There is a fuel system integrity test you can run. It measures the fuel pressure leak down rate after you shut the engine off. If you take it to the dealer with this complaint that is most likely the first thing they will do.

 

Mines in the shop for high fuel pressure bleed down when shut off . It throws a code for it spn1077 fmi14 . Also my oil level went up that’s why I put it in the shop on the road . It runs perfect otherwise.