HML question HELP!

I would like to draw out a scenario and see if you guys can help me out.

If I am about to purchase a preforeclosure, obviously I need that cash handy to buy the equity. Now What are the requirements of HML? Say I need 50k-100k. Will they lend me this? I heard HML research how much equity is on the house and then deterimines how much you need? Thanks to all in advance.