1998 GMC Suburban NO FUEL PRESSURE

Hi, there should be a fuel pump test connector, under the hood, driver side fender lining, close to firewall. If you use a jumper wire with inline fuse connected to battery voltage, touch the test connector, should be a red wire with electrical connector, nothing plugged into it. The pump should run, you don't need to use the key.

Also, under the vehicle at the rear, there is the connector for the fuel pump. Don't how easy to get at, you'll have to look. Gray wire is voltage to the pump motor, black wire is ground. Engine cranking you can use testlite to check for voltage, gray wire. Check ground, also.