After getting the truck really wet off-roading (might not be related given the trucks miles), i have been experiencing power loss once the the engine heats up. Excessive fan noise (new fan and fan clutch, new radiator, new water pump, no coolant temp issues) and having difficulty maintaining speed on the highway, especially up hills. I wasn't able to hold 70-75mph on a slight grade. No codes. My recent thought is the fuel pump and filter. The filter is easy, i am going to to that first. what are the signs of a failing fuel pump? what is the service life on it? I am looking to do some long drives this summer with family and looking for what could go wrong ahead of time. Injectors are probably original, send those out for rebuild?