WI not Spraying?

[javadoc]

I have a 1S system installed in my 1996 Volvo 850 turbo, and for some reason the system isn't spraying. I have the pump mounted on a mounting plate that I fabbed, attached to the battery tray (driver's side) and the fluid supply is about 45" away on the passenger side. I have the pressure sensor mounted to the driver's side fender in the engine bay, with about 27" of silicone vacuum line running from it to the vacuum tree, for boost pressure activation. The run from the pump to the jet is only about 18", just after the intercooler.

Now, I can get the pump to spray mist if I disconnect the pressure sensor and start the car, but with the pressure sensor wired into the mix, I'm not noticing any mist/pump action. This I confirmed by the fact that I'm not using any fluid, and I still have blue fluid in the line between the pump and the jet nozzle... I switched to an orange colored mix, so it being blue there tells me nothing's happening.

I'm fairly certain that I have everything wired up correctly. For power, I've got the red and blacks to the +/- battery terminals respecively, and the purple lead goes directly to the positive terminal on my coil. It's got a brand new fuse for the pump too.

I'd appreciate any help on this, b/c it's annoying to have this setup and have it looking good, but not actually performing.

Thank you!