Hey guys, every morning I go out to start my truck up to let it warm up i gotta crank it and hold down the throttle half way cause there is air in the lines. I have checked all my fittings from the tank to the injection pump and all the injector lines and none of them are leaking. Also recently i just replaced my stock lift pump with a airdog frrp thinking it was the pump and it is still doing it. For the life of me i cannot figure out how air is getting into the system overnight. its strange though how it only happens when it hasn't been started for a while and the engine is cold. if anyone has any suggestion it would be a big help.