1991 Pontiac Bonneville will not start tried everything!

I have a 1991 pontiac bonneville 279,000 miles V6 3.8L. It will not start. The engine rotates but won't start. Also has a smell of gas when tring to start it not to bad. It got hot and died and has not started back up. We have replaced almost everything we can think of. The ignition coil, spark plugs and wires, cam shaft sensor ( magnet is fine), crank shaft sensor, all plugs are firing, the injectors are fine, it has pressure in the spark plug holes, theres fuel pressure, theres no water in the engine oil, all spark plugs when pulled are wet (no water on them). The computer is not throwing any trouble codes either. I'm down to nothing. Please help with more possibilities! Could it be the EFI Cold Start Relay and where is it located at on the engine? We have spent quite a bit of money on this car and no luck:(