Have a 93 Riviera, V6, 185k - would not start yesterday, fuel gauge was blinking 'low', I added 2 gallons from a can, it started right up. I then proceeded to the gas station where I filled the tank half way. A couple of hours later, after driving it appr. 25 miles, it would not start. It turns over/cranks fine just like normal, but acts like its not getting any gas to the motor. Was wondering if it could be the fuel filter or fuel pump, and how I might check or diagnose it?