Blue barrels available all over the place. Got some from a car wash, they held soap. Still had to rinse them out, once done, nice and clean. Most towns have vendors that collect, clean and sell drums.
Cleanest barrels on the planet are some I got from a local boat builder. Acetone drums, absolutely shiny inside. But steel, so a little less friendly to the boat world.
Do not try to clean out resin drums. Useless for fuel and it takes more acetone to clean them than they are worth. Resin drums only good for burn barrels and boy that first burn rocks and rolls!! Caveat: For country living only.
Regarding fuel pump, a Facet 40185 is a handy low cost generic 5psi diesel pump. I try to keep one around.