gen III 3sgte runs for 5 seconds and shuts off Options

[match220]

engine: gen III 3sgte powered by autronic SM4 ecu, walbro fuel pump and stock injectors

This is my first time starting this engine since I bought all of the parts for it (formerly parted out), rebuilt it, and wired in the Autronic ecu. My engine starts and runs for about 5 seconds at a time and then it dies from a lack of fuel from the sound of it (not the fuel pump shutting off). I have a feeling it has something to do with the fuel pressure regulator. According to the vacuum diagram that I found in a google image search it doesn't need a vsv and it connects directly to the intake manifold, but I'm thinking that I need a vsv between it and the manifold. I am tempted to put on my AEM fuel pressure regulator that I have lying around but I would rather get the stock one running first and then work on getting the aftermarket one going.