There are 2 basic types of pumps. Low pressure for older cars wanting to fill carbuerators, and high pressure, for fuel injected cars. I think the low pressure ones are like 9 lbs, and high pressure ones go for up to 30 lbs or so (off the top of my head).
The parts certainly "could" be food grade, but you'd have to find out what materials will be contacting the wort and look them up. The pump itself would certainly not be certified as food safe since that is not anywhere near the intended purpose.
I think there is a good chance the housing would be made from Delrin, or Acetal Resin. I believe that is food grade, but look it up to be sure. Some of the parts we make are Acetal and they are used in fuel filler applications, and I am pretty sure the fuel pump housing molds we've worked on used acetal in the manufacturing process.