I have 12 winnebago, but also had fuel pump failure last year. Yours kinda sounds the same except after a while mine would not start. Pulled codes with none to be found, ended up at a shop on 4th july weekend. Could not get codes even with the ford scanner. Anyhow finally replaced the fuel pump relay (after the fuel pump, tps couple of other things) and all was well.
Yes you could be due a tuneup, but see if you can get the relay tested or just replace as they are not that expensive. A lot cheaper than trying to R&R fuel pump. I think at ford they were like $65 US same at Oriellys. Autozone was $200+!