1994 flex fuel died
 

My 1994 flex fuel died today. No pressure at shrader valve, pump is running as normal, a few seconds when key is turned on and constently when cranking. I took the filter off and it is not clogged. With filter off I turned the key on and no fuel, but the pump is running. Will the pump work off a non flex fuel taurus? What years,1988? I will never use anything but unleaded in it. Could the pressure valve on the engine be the problem?
thanks