Volvo VNL won't start although cranking normally

Last 10 days starter was slow for a few seconds, but it always started the engine.
Today after 4 hrs of drive, I made a 40 mins stop.
Didn't want to start. Oddly, starter was working perfectly. Batteries were 12,4.
Mechanic sprayed starter fluid, changed fuel filter filled with fuel... nothing again.
It started for a few seconds, but weakly and not responding to gas pedal at all.
Good man charged me only 25$ for filter.
Than I called the other one.
He checked the batteries, main fuses (I think he couldn't find a fuel pump fuse), he saw that alternator sends voltage back for that short time when engine starts weakly... and charged me 400+$ for that
Didn't solve the problem.
Now I'm freezing in truck, waiting for a tow tomorrow morning (if possible, because of the snow).
Is there any miracle man with the right advice out there?

 

Sorry, my bad.
Cummins, ISX, 2009, manual.
I had 3 mechanic worked on it.
Third one changed 2 sensors... speed sensors or something, but no joy. He lift pump, didn't start again. Batteries ok. Starter ok. He said ECM is ok too.
No fault codes on computer diagnostic, except 2 old ones: too low coolant (not true, probably bad sensor), and out of calibration error, that's my VGA. Have that codes for years now.
Than I've got towed to his shop, took a hotel and waiting for outcome tomorrow.
Actually, hoping they will figure it out what's wrong.
1000$ so far including rip off from second mechanic, towing and hotel.
This is becoming interesting.

 

I told the first mechanic to change a filter and prime it.
But as soon as he removed the old one, I saw it's full with fuel....
So didn't start with new one too.
I was driving 4 hours before pulling over, and the truck was turned off for 30-40 mins. Temperature was around 32-33... I don't think it could freeze under those conditions.
I added last night 911, but the truck is stubborn... won't start no matter what

 

Today in this repair shop where my truck ended, I saw a brend new Peterbilt classic. 200k$. Looking gorgeous. No ELD. No EGR. No sufficient sensors. Jaw dropping rig.
If you wanna be o/o, and ready to stay 7 days on the road, that's how you can make childhood dreams come true
Yeah, that 200k might be a slight issue
But those new ones...
Just talked with my trucker friend, my former boss bought 2 brand new volvos...
And both of them spends more times in service shops than on the road.
I don't know what to do myself, don't have nerves for twilight zones like this, although I have pretty good truck.
I smell total spending here around 2,5k, plus 2-3 days of sitting (in my case freezing) in the place.
The beauty of the story is that I still don't know what is wrong with my rig.
Lovely.