Other Fuel System Tank Mounting problems of the 2001 Chevrolet Suburban

Fuel pump may falter or fail; fuel pump relay was non-functional, replaced it; other fuses passed testing with meter; vehicle started, would not run more than a few minutes. New fuel filter. Guy at service station banged on gas tank, and it would start then run great for a minute, then will not restart. Ordering a replacement fuel pump. Bought this vehicle in 2005 about the time of gm recall 05027. In doing online trouble-shooting today, I discovered the 2001 gm recall 05027. Have had this problem several times. Fuel filter was last changed in July 2009. Complete failure when in motion, backing out of service station onto main street (us 64 bus), just inches from lane of travel (6. 14. 19). What could be worse than fuel pump failure at a busy intersection during lunch hour? grateful it didn't catch fire, or get hit. As the service attendant tried to restart it, over and over, the relay in the ecu may have failed at that time. In the interim, my husband died. I replaced relay/fuses today 9/14/19, and vehicle started, but would not stay running. Another mechanic banged on fuel tank, it ran for a while, so he advised replacing pump, which is not rocket science after viewing youtube how-to videos. With the pump failing sporadically, and responding to the vibration of being banged, it seems like faulty wiring or connection problem, or that something is loose or not fully seated anymore. Lots of folks say the chevy 1500 is widely known for fuel supply problems. Gas gauge has not been accurate ever. When full, it may show empty when turning or hitting a slight bump in the road. (track by computing mpg and mileage, to determine range). In short distances, it swings full-> empty->full. Wiring diagram shows tiny fuse labeled prime, none there. Abs indicator lights up because sensor cable at right front tire may fail on left turn, or hard right turn, yet brakes are fine.