Ok I see you posted while I was typing. So you already tried the fuel tank/bottle close to the pump? It takes 3 things to run Compression, fuel, ignition. You know the compression is good enough. It sounds like you are saying it's sputtering while cranking over so it would seem that it has ignition so is it flooded or plug fouled? Hit it with just a touch of starting fluid or gas just to see if it takes off. If it does, you have a fuel problem. If it doesn't you need to see why the ignition wont light it. Be careful, garages and houses burn all the time from stuff like this. Just want you to be safe.