Thanks Rapid. Summit has a little more info, but I kind of doubt the veracity, it looks like they copied the entry from the other MP fuel pump and added the MP catalog description you provided.

Summit says 6.5 max psi, which is what I want obviously, but if that rating is at say 4-8K, what is it at idle? I just don't want to eat up the savings from a sweet deal with the added cost and complexity of plumbing a regulator.