I am not one hundred percent sure on the Fleetwood but most other units HR, Monaco, etc have PEX waterpipes connected with compressed brass rings, usually 1/2 inch pipe. Getting to the pump is only half the battle as you will need the crimping too, some extra pex pipe and crimp rings. There are many places to get the tool and fitting and pipe and everything is really cheap except the crimp tool. I have used pex to plumb my entire house, geothermal waterlines running through the cement slab so I had everything I needed. It might be cheaper to just have the dealer do it unless your a true do it yourselfer.
2002 Holiday Rambler 40 PBT