Wife ran out of gas and now cant get it to start. Had it towed home, engine cranks, even when you release the key and it sets back, have to turn key off to stop it. Only codes was the MAF sensor, which I replaced. Had battery checked, starter and alternator all are good. Have put about 10 gallons of gas in, sitting in a level spot. Checked fuel pressure and at key on it's at 80psi, then drops to zero. Any help would be greatfull.