a little trick i used to use, if it feels as if the is no fuel in the engine, remove the air filter and put 2-3 drops of fuel directly into the carb and open the throttle so it flows into the engine. Or you could try deliberately flooding the engine, then remove the glow plug, flip the car upside down and pull the pull start a fe2w times until all the fuel comes out. then you can re fit the glow pplug and then you know its fully primed