Hi, I am trying to locate the ECU in my 2001 GMC Savana cutaway van chassis box

What is your question?

I have been having problems over the years with no starts. I had the truck running the other day ready to drive off and the truck died. I checked gas (gas gauge problems for years now), and added gas,and still no start. I hear the fuel pump when turning key to "on" position. I wanted to look at the ECU to see if it is corroded, but can't locate it. Thanks for any help!