Discussions like the above really are scarry!! It's not "when" ... but "where" the fuel pump goes out that's my concern. What if it gives up way out someplace in a boondocking spot?
I'd pay extra for a special dual fuel pump setup in which two fuel pumps were running in parallel at all times, with a warning light when either one of them failed. Since the chances of both failing at the same time are vanishingly small/near zero, two pumps in parallel would stop any concerns of ever being stranded for that reason. Fuel pump failure is one of the few things that can stop you dead in your tracks and that can't be fixed on the road by the owner or ERS. There's no "limping home" with a failed fuel pump. (Although some owners think that they can replace a fuel pump "fairly easily" if there is an access port in the floor of their RV.)
Perhaps Ford motorhome fuel pumps should be replaced before they fail every ??? miles .... the same as certain other super critical Can-Leave-You-Stranded preventative maintenance items?