Primer coat on.
I have retaped the center so that the black paint to come will just clear the primer. That way the primer won’t be peeking out under the black.
I started to wipe down the pump with parts solvent and a thin layer of cover paint began to disintegrate. The paint underneath on the reservoir seems good enough.
The pump body itself turned out to be raw casting under the cover paint. I’ll give the whole pump a good coating.