Yes, remove the bed.
You also need a torch to burn out the rubber bushings, I just used a hand propane torch, but definitely remove bed for that part or run water in the bed as it will get VERY HOT and blister the paint.
I used Dorman parts on my '94
I also used Navel Jelly and wire brush on rusted areas a few times before repainting and then installed hangers and shackles, but I had a few days to do it.
Rust is Oxidation same chemical reaction as fire, although alot slower, lol, so leaving any rust is like leaving a simmering fire.
Reason paint stops/slows rusting is it prevents oxygen from contacting the metal, painting over rust will just allow the "fire" to continue "burning" which first removes the paint fairly fast then oxygen gets in and it starts to spread again.
Navel Jelly, or similar products, changes the rust it comes in to contact with, into an inert substance that can hold primer and paint.
Primer is a type of paint that can hold onto metal better, but is not very resistant water, sunlight or other environment elements, regular paint is better to resist environment elements but can't hold on to metal very well but can hold onto primer, so prime and then paint is best.
My 1994 Rangers fuel pump is original and still working fine, knock on wood, but I would check your connections and wiring.
Last edited by RonD; 11-06-2015 at 10:27 AM.