I’d like to point out that this car has a very unique rotary engine that does not operate the same as regular piston engines. There is no easily accessible fuel pressure regulator or fuel filter as both are built into the fuel pump assembly. Worst case scenario, if this engine cranks but won’t start it’s likely got bad compression and will require a rebuild, however if your lucky it might be something else. These motors are very high compression engines that rely on crucial Apex Seals to run effectively. These seals need to be lubricated very well to last long and if they aren’t via the oil injection system or premixing the fuel with 2 stroke oil they are prone to failure. Because of this lubrication method they are prone to clogging catalytic converters which can prevent a startup. Another common failure is the starters as they require a very fast cranking speed to start. If it cranks fast you should definitely check the spark plugs as the oil burned in the combustion chamber makes them prone to fouling. The ignition coils from the factory are also somewhat weak and fail quick so they are another good place to check while dealing with the ignition system. If you feel sure fuel, spark and cranking speed are all intact, a compression test can be used to determine if the internal seals are functioning well. A compression tester is connected to one of the spark plug holes and the engine is cranked until the tester reads a number in PSI. Rotary engines have 3 combustion surfaces per rotor so they require special compression testers to show each of the three faces. In simple terms, a good engine should read about 100psi. Anything below 60 or so may need a rebuild. Running Premium gas with a good premix is o me of the best things you can do to keep this engine running well and prevent loss of compression, however they are victims of damage from overheating. Keep a careful watch on the temperature gauge when driving and if it reaches the half way point measures should be taken to ensure it does not get an hotter, like blasting the heater or even pulling over and turning it off to let it cool down. Good luck and I hope you can still appreciate the beauty of this car.