After driving twenty minutes engine shut off

While driving the car about twenty minutes it stopped running as if it had run out of gas. Repeatedly tried to restart but only fired for about three seconds each time.
Had towed home. Replaced the fuel filter which looked rather old. Correct orientation verified. During replacement very little fuel drained from either inlet/outlet hose. The filter was completely full, took a while to drain. Inlet side drained some black sooty fuel. After fuel filter replacement, car would turn over but not fire. Recharged battery and tried again hours later. Same result. Located the fuel pump relay (based on internet information). Found another relay identical for the window washer pump and swapped. Tried to start again but same result.
Removed the fuel filter, verified orientation again. Good. No fuel came out either hose. There was no fuel in the filter. Tried to siphon fuel from both directions, got none. Turned key to on. No fuel flowed. Could not siphon fuel from either direction. Tried a tire pump with a hose attached fitted into the fuel line. Lot of back pressure and could not pump. Same both directions. Tried to blow into the fuel line back into the tank and heard a slight gurgle in the tank but not much. Does this sound like the fuel pump?