Dual Fueler or Lift pump??
 

i have a 2013 f250 stock everything other than 5in DP back straight pipe with EGR delete and GDP tuning Ezlynk im currently running the rampage SOTF tune for some reason a new update done away with the normal SOTF stock-150p tune im having a problem with low rail pressure CEL getting thrown i dont really care for running hotter tunes but id like to have the fuel there if i need to run it so my question is would an airdog or fass work to keep fuel pressure up or would i need something along the lines of the H&S dual fueler kit?

By a lift pump, do you mean the low pressure pump under the truck..? That won't help you. You need a hpfp upgrade. Or maybe a lighter tune would be in order. I'd call your tuner company and ask them.

Usually a 2013 can put out close to 500 hp on its stock pump no problem. Unless your pump/fuel system is going bad..?
If you set your tuner back to stock power level does the cel still come on..?
If you don't need/want the bigger power then lighten up on your tune..?

Some aggressive tunes need lots of fuel to attain similar power as other tunes that don't need as much fuel. But for our trucks <2015, 475-500 hp seems to be the ceiling with stock hpfp.

i just purchased the truck maybe a month ago i had the stock-150hp which from what iv read is about all the stock pump can keep up with but for some reason they done away with it and all that is offered is what GDP tuning calls the rampage with goes up to like 175hp with the SOTF switch and recomends a pump.. Like i said i just purchased the truck so as soon as its time for oil change the fuel filters will be changes for a baseline and no the CEL light only does it with the hotter tunes i know thats what its from i was just trying to get some knowledge about the pumps but yeah the stock-150hp that i had installed was what the truck liked, seems like i need to contact GDP tuning like you said thanks for the input..