no start problem. need ideas

[colson12]

So I was wheeling last night. And I came to a hill where I became very off camber almost to the point of rolling the truck. It was running and it ran the whole time while I got a winch to straighten myself out and get up the rock. After I shut down the truck for a minute. When I got back in to fire her up nothing. It cranks and catches but will not stay running. I have a keg setup with a low fuel pressure pump under the keg which goes to a high pressure fuel pump down under my cab. I can hear both running and I know the low fuel pump is putting out and I can hear the fuel returning to the keg. Anyone have any ideas on what it could be. Or where to start. Anything would be help. Thanks

 

[RonD]

If you can hear fuel returning to the tank when cranking then Fuel Pressure Regulator(FPR) is stuck open.
FPR is normally closed, it only opens when vacuum is high, so at idle, with key on/engine off and while cranking it should be closed, so there should be no fuel returning to the tank.

Also check the FPRs vacuum hose for signs of fuel inside

Will it start and stay running if you spray starting fluid in?
So spark is not being cut off?