Originally Posted by jax4557

I have the same setup as you but only S1.E, walbro 485, 1150cc injectors, E85. I also have fuel reference set to 42 psi, you should get 1 more psi of fuel per psi of boost. Can check by revving and watching your pressure under the hood if you don't have a gauge in the car. When I shut the car down my pressure stays around 40psi for a few minutes and then around 20 minutes later it will hit 30psi, I have not watched it long enough to see if it goes back to 0psi.

With the immidate 0 PSI on shutdown I would say you have an issue with your regulator, return line on regulator hooked up wrong, or maybe something in the fuel basket but I don't think that could be it..