Yesterday
Started the truck not plugged in with good batteries everything worked good,temps were above freezing when i started it.Got to -6 C overnight.
Idled it for 1/2 hour or so,disconnected the battery from the lift pump and took it for a short drive.Basically a wide open throttle romp to see what happened.
Good power for a 6.5 in a HD truck no excessive smoke,no hesitation.
Parked it,shut it off and it fires right up.Left it for an hour,no start.Two hours no start.
I did try disconnecting the temp sensor on the thermostat crossover,no start.I did the continuity check on 6 plugs,but didn't remove them for the ultimate check.
There is no function on the relay for the fuel pump when the key is on,and no power at the fuse for the fuel pump.Both the fuse and relay are on the firewall.I did check to see if power will get to the lift pump by jumping the relay plug and the wire is good to the pump from the relay.
No SES lights at all.