This is the pump I used. Not a high pressure pump at all, but I believe it only needs to maintain supply to the injection pump and then that takes over. If I'm mistaken I'm sorry, but I can tell you this exact pump worked great on my MDJF and Jeg's is selling it for half of what I paid. At $28, it's not much of a gamble.
https://www.jegs.com/i/Autobest/035/12D/10002/-1