Bill Bosworth

We have a 2006 Civic that my son drives. He called me last night to say it would crank but would not start. It was at his work. He thought it was the fuel pump and it doesn't seem to be getting fuel. After a lot of research I am leaning toward the PGM-FI relay. However, I have some issues with this. According to a diagram, there is a PGM-FI main and a sub but I can't really find any reference to the sub online. Also, I have seen it called the main relay online as well and there seems to be a discrepancy about where things are located.Some point to a main relay being under the dash at the interior fusebox. Others seem to point to it being in the under hood fusebox and that is what the diagram I found says. I feel it is under the hood and it's the older models that have it inside but I want to make sure. I am an ok diy mechanic (I've changed transmissions, done brakes a lot, starters, etc.) but I know where my skillset ends and I this is out of my comfort zone. I also know better than to just start throwing parts at the problem and if it winds up not being this, I am going to have it towed to Honda to have it looked at. But if it is this easy I don't want to do that. Thanks in advance for your help.