Duel Fuel Only Runs On One Fuel?

[68f250360]

i have a 95 f250 4x4 7.5 running on propane or gas. due to gas prices i have been running it on propane, but now that gas has gone down i what to run it on gas but it wont switch over. i flip the switch and the thing just dies. so when the truck isnt running i turn the key on and off to "charge" the fuel system but nothing seems to work... the fuel rails are getting pressure, i check. i also check the fuel reset switch but that was fine. so i got out the test light and started to hunt down wires but i cant find the problem. i dont know if the gas went bad, i dont think so cause i added additives last time i filled up. can someone help???

[myv-879]

Possibly by not using Gas (petrol) something has dried out and is not operating. This used to happen to me in my carby 351 dual feul. I went through a feul pump and a carby kit because they dry out without feul going through them, Im now rebuilding it to run straight gas. What good does the gas (petrol) do anyway?

[gasman6674]

Check your fuel pressure and filter also check to see if your injectors are working
I am assuming your gasoline line does not have a fuelock (solenoid) that was installed when it was converted

[351M]

Could it be possible that something went wrong and the injectors have been running dry for awhile and died?