I have a 1994 GMC seirra 1500 with 5500 kms on it. it has sat for 5 years. i took the fuel tank out and drained the old gasoline, changed the fuel filter, and put a new battery and gas in it. the truck turns over but i am not getting fuel to the carburator or the fuel filter. i checked the wires going to the fuel pump and it has only 8.4 volts reading with the ignition on. i cannot hear the fuel pump even turn on when i turn the ignition on. i don't want to replace the fuel pump because i fear that there is not enough voltage to run it properly.

what should i do ?