1995 Chevy Van code 54. Fuel Pump Circuit

Electrical
1995 Chevy Van (G20) 5.7L Single Point TBI Two Wheel Drive Automatic 142000 miles

This van was purchased used. The van sat for a year, but it started fine and ran excellent during the test drive. After purchase it suddenly died less than 5 miles away from seller. I checked the battery and it was dead, so I replaced it, but the van didn't want to start, it seemed to have no fire. I gave it a tune up (plugs, plug wires, distributor cap and rotor, filters, and oil change). Now it has fire and wants to start, but it will not idle, and dies if I give it gas, unless I am pumping it. A friend ran diagnostic and it says (code 54) fuel pump circuit. I need to know how I should begin repairs with this circuit and where is the fuel pump relay located. I chose subject electrical because diagnostics said circuit, but could it be a fuel filter or pump? I am NO mechanic.I can do minor repairs myself. ANY insight will be helpful, Thank You.