If you test out the fuel pump, don't run it dry because it can be damaged. Most liquid pumps will burn if there's no liquid run through it. Perhaps you can have the emergency fuel tank (the red plastic 1 or 2 gallons) and have the fuel pump to it, while the pump inlet is in the car tank.
It could be the fuel pressure regulator, too. My desktop computer has the manual repair on it, but it's in the repair process so I can't help much with specific details.