1992 Chevy Astro fuel

Doesn't have a specific fuel shut off like Ford but do have oil pressure that cuts off pump in the event of pressure loss.

Hello, I didn't see a 4 listed for your vehicle? I looked at a 6 vin Z. There is no cut-off switch that I'm aware of. There is a fuel pump relay, under hood, passenger side of engine on the firewall. There may be a fuel pump prime connector close to the relay, gray wire, nothing plugged into the connector, if you use a jumper wire and run B+ to the connector, the pump should run. It's just a test connector for the pump, you don't have to use the key. You might ought to use an inline fuse on the jumper.