1994 Dodge Caravan 1994 3.0L 6 cyl. Dodge Caravan fuel pump

I guess I should have been more clear (it was late and I was tired) I know that the fuel runs as needed while the engine is on what I meant is that when you turn the key to run instead of just running for a few seconds to pressurize it just keeps going. It is making a loud whining noise that is noticable from the inside of the van which I know it wasnt doing before. And it will idle at warm temps for a while but as soon as you try to drive it and what not it starts acting like it isnt getting any gas. We have already changed the fuel filter and checked the fuel and asd relays multiple times.I have also already changed the TPS, had the EGR valve checked, cleaned the throttle plate, bought a new distributor, rotor, and optical pickup coil(ignition module), coolant temp sensor and really am at my wits end with this thing.I cannot afford to buy a new van and with this not running right I cant even sell it to get the money back for the parts we have put in it. My FIL was the one who suggested the fuel pump since he was having the same problems with his car and it turned out to be the pump. And after some research online we have decided it could be the pump or it could be the fuel pressure regulator.I was just tryng to see if the symptoms fit the pump more or if they fit the regulator failing more.