All I know is that I would not want to purchase a used pump just laying around dry for an extended period. Much preffer a pump direct from a sitting engine. Finding a container about the same size and just submerging in oil would be my prefference. At least up past the delivery valves. Almost mandatory for your region probably. Should come out ten to twenty years later in about the same condition as put in. Any method where rust can get involved is absolutly taboo with those internal cylinders. A point perhaps of little knowledge. Submerging something in varsol will seize things up so tight they are usually finished. Even short term is to be avoided. Want to experiment? Take a rod and piston assembly. Submerge it in varsol for two weeks. See what it takes to get the wristpin out. Almost bet you will damage the piston. Seen people pay dearly to learn that. Just cheap non detergent motor oil should be best I would think. At least thats what I would do unless someone posted something negative about it. I can be wrong.