Engine no worky

[Paladin]

Friday I pulled the bus out for a while. It started fine, ran well, all was great and when I was done I pulled it back in and shut her down. About 10 minutes later I tried to start the engine again and it spun great but would only run as long as I held the starter down and never did really come up on the power. Rather than maybe make a small problem large I didn't keep trying too much. I was afraid of maybe sucking junk through the fuel filter or
It was late in the afternoon so I quit and with the snow today haven't had a chance to do any real troubleshooting including sticking the tank or anything. I don't have a gauge but I was pretty sure I had a decent amount of fuel in there. I'm thinking maybe out of fuel or clogged filter?? 

I seem to remember something very similar in a post some time ago maybe but I can't find it now.
Anyone have any good suggestions before I go out and look her over more tomorrow?

[belfert]

Is it any colder now than the last time the bus ran?  Could you still have summer blend fuel?  I had a diesel pickup that ran for about 10 minutes before the fuel gelled.  The pickup was brand new and the best guess is that the factory uses summer weight diesel.

[Stan]

If the engine runs by holding down the starter switch, this indicates a safety switch is open. The starter circuit over rides a fuel pressure switch and the low oil pressure switch and maybe others. The over ride takes place in relays in the rear control panel. Follow he wiring on the starter electrical drawing.

[JackConrad]

A quick test is to disconect the low oil pressure shut down sensor ( on the frame rail, left side on engine, next to the oil pressure gauge sender) and the hot engine sensors (one on each thermostat housing).  If the engine runs, reconnect the sensors one at a time and see if the engine dies. If the engine acts the same with all sensors disconnected, you will have to go a little deeper into the wiring. Jack

[Lin]

The other day, my engine would seem to be starting but cutoff as soon as I came off the switch.  It turned out that I had tripped the Emergency Stop button when trying to fit a cover to it.  I like quick fixes like that!

[Paladin]

I didn't think anything of if before but I was spraying some carb cleaner on a few spots trying to clean up some oil build up. One area was right where Jack said to check, I wonder if I shorted it?

As soon as I can get back out there I'll try to check out some of this junk.

Thanks guys!