My wife's stock 91 5,0 LX quit Sunday morning. I'm not sure what's wrong. It has spark but when the key is turned on the fuel pump always primes the system and shuts off. Now the fuel pump keeps running. I don't smell any gas and I don't see any leaks. I have pressure at schrader valve on the right front of the fuel rail but I hear a hissing noise at the same time that I don't recall hearing before.
And yes there is gas in the tank. But it is less than 1/4 tank.
Does anyone have any ideas? Also what should the stock fuel pressure be?