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This is caused in most cases by a defective fuel pressure check valve, when this check valve fails it allows fuel to drain back out of the fuel lined and filter and fuel injector fuel supply rail and then you must purge the air out of the lines and filter before the engine will start and run smoothly, The fuel pressure check valve is part of the electric fuel pump and is located inside the fuel tank.
Usually this is because the carburettor dries out and there is a needle and seat (internal on carby) that can get stuck and not let fuel in. Usually from a little dust water and general **** that comes with the fuel. Id spray the carby out with carby cleaner, remove the fuel line from it and spray out the fuel bowl. Possibly even open up the carby and completely clean it, but only if you are confident on putting it back together. But try just spraying it and cleaning it first, then tip probably a quarter (1/4) of a cup of petrol in the hole in the carby and try starting it, this should make it run. Maybe a little rough at first, but you may need to clean the carby a couple of times, and will need to pump fresh fuel from the tank. So good luck and hope it helps.
dave again i just posted you so it is definately fuel related listen to see if the fuel pump turns as described in my last post if it does not you can test the relay by replacing it with a known good relay like the horn if your horn works but your fuel pump does not turn swap em see if the horn works still and if the pump now works. If the pump works and the horn does not reinstal the horn relay in its original position and replace fuel pump relay. do the same with fuel pump fuse as sometimes the fuse looks okay but is not. If you have a test light hook it to ground and make sure both metal tabs on the fuse light the light when the pump is activaed.