If you have the spin on filter, make sure you also replace the O-ring on the threaded shaft before you put the new filter on. If you have the type with the sight guage, then I have not done one of those, but it's a water fuel sperator type, and again, it should just spin off/on.
To prevent the fuel to flow, you can get some hose clamp off pliers at NAPA auto parts I have been told. I am going to get two pair of each size, so I can also crimp off radiator hoses if necessary. In a pinch (no pum intended), taking some needle nose vice grip pliers and putting small vinal hose over the jaws to protect the surface you are going to crimp off should also work, be careful, it seems WRV used plastic fuel lines on the HH install, and I don't know the life expectancy of this material.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech