1991 Toyota Pickup fuel problem

My truck engine will start but won't run. I took the fuel pump out of tank and put the meter on it. I get nine volts to the pump when engine is cranking, but when I let off the key, volts goes to zero. I can spray starting fluid in the intake and the engine runs fine, but as soon as I stop spraying the engine stops. I hooked battery directly to the pump when I had it out and pump ran fine. Any ideas? Thanks, David.