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Herman, it would be helpful if you could provide some further input. Do you smell gas when the car is running only, or all the time? The comments about undercoating are very good. A thorough exam under the car starting under the rear seat and moving back will turn up a lot. If fuel is leaking from the main fuel pump, the filter, the lines to or from the tank, usually you'll find the undercoating turned into a sticky mess by the drip. Of course a leak will affect mileage. If nothing in back, work your way up to the front of the car. I'm going to assume a leak is not the problem or you would have found it. If it were not for your mileage comments, I'd say perhaps the seal on your tank sender/prepump unit might have failed. Fumes can escape there.
If you only smell gas when the car is running, and the smell dissipates when the car is off, you may have a rich running problem and that would explain the mileage also. Possible culprits would include a bad engine coolant temperature sensor (under the #3 intake runner), a leaking cold start injector (plumbed into the underside of the intake manifold on the engine side--blue plug), leaking fuel injectors or a bad fuel pressure regulator.
I believe your 92 will have a fuel pressure check port on the injector fuel rail. It should also have a test port at the back, in the lines around the main pump. If the pressure at the rail is too high, the regulator has failed.
If you have no pressure gauge, I'd say the easiest thing to check after looking for leaks is the injectors. Pull your spark plugs and see if they are wet. If so, you've identified rich running. Remove the rail and the injectors and see first if any of them are dripping (which plug was wet--for a clue). If so, you've found your problem. You can force compressed air through the injectors. Unplugged from the harness or with ignition off, they are closed and should not drip. If any pass air from your compressor, they need to be cleaned or replaced. Powering them can identify if they are working at all as they will click quietly. If all the injectors are "closed", I would move on to the cold start injector and see if it is leaking.
If all of your injectors are closing, and in the absence of a gauge to check pressures, but having said that your vacuum line to the FPR is dry, I'd say the ECT is bad. This may be accompanied by hard starting and the car seeming to "flood", as we used to say in carburetor days of old. In fact, if your problem is most evident at startup, and the car is difficult to start, I'd go with the ECT first.
DS
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