2000 Chevy Suburban Fuel problem - Long start and rattling

Up until a week ago, I could tap the key and the truck would start. Now it needs to crank a few seconds before starting. When the engine does start, it stuggles for 5 -10 seconds to stay running before it settles down to a normal idle. When I turn the key, each time I can hear the fuel pump engage and it runs for a couple seconds and then stops. Sometimes I also here a rattling noise like it rattling from underneath the car and the rattle moved up to the firewall area. This happens when the fuel pump is running.